removing modules not ready for release
diff --git a/commons-numbers-complex-streams/LICENSE b/commons-numbers-complex-streams/LICENSE
deleted file mode 100644
index 261eeb9..0000000
--- a/commons-numbers-complex-streams/LICENSE
+++ /dev/null
@@ -1,201 +0,0 @@
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-      the conditions stated in this License.
-
-   5. Submission of Contributions. Unless You explicitly state otherwise,
-      any Contribution intentionally submitted for inclusion in the Work
-      by You to the Licensor shall be under the terms and conditions of
-      this License, without any additional terms or conditions.
-      Notwithstanding the above, nothing herein shall supersede or modify
-      the terms of any separate license agreement you may have executed
-      with Licensor regarding such Contributions.
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-   6. Trademarks. This License does not grant permission to use the trade
-      names, trademarks, service marks, or product names of the Licensor,
-      except as required for reasonable and customary use in describing the
-      origin of the Work and reproducing the content of the NOTICE file.
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-   7. Disclaimer of Warranty. Unless required by applicable law or
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-      Contributor provides its Contributions) on an "AS IS" BASIS,
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-      PARTICULAR PURPOSE. You are solely responsible for determining the
-      appropriateness of using or redistributing the Work and assume any
-      risks associated with Your exercise of permissions under this License.
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-   8. Limitation of Liability. In no event and under no legal theory,
-      whether in tort (including negligence), contract, or otherwise,
-      unless required by applicable law (such as deliberate and grossly
-      negligent acts) or agreed to in writing, shall any Contributor be
-      liable to You for damages, including any direct, indirect, special,
-      incidental, or consequential damages of any character arising as a
-      result of this License or out of the use or inability to use the
-      Work (including but not limited to damages for loss of goodwill,
-      work stoppage, computer failure or malfunction, or any and all
-      other commercial damages or losses), even if such Contributor
-      has been advised of the possibility of such damages.
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-      To apply the Apache License to your work, attach the following
-      boilerplate notice, with the fields enclosed by brackets "[]"
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diff --git a/commons-numbers-complex-streams/NOTICE b/commons-numbers-complex-streams/NOTICE
deleted file mode 100644
index c1a3017..0000000
--- a/commons-numbers-complex-streams/NOTICE
+++ /dev/null
@@ -1,6 +0,0 @@
-Apache Commons Numbers
-Copyright 2001-2021 The Apache Software Foundation
-
-This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
-
diff --git a/commons-numbers-complex-streams/README.md b/commons-numbers-complex-streams/README.md
deleted file mode 100644
index dbd9451..0000000
--- a/commons-numbers-complex-streams/README.md
+++ /dev/null
@@ -1,105 +0,0 @@
-<!---
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements.  See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License.  You may obtain a copy of the License at
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
--->
-<!---
- +======================================================================+
- |****                                                              ****|
- |****      THIS FILE IS GENERATED BY THE COMMONS BUILD PLUGIN      ****|
- |****                    DO NOT EDIT DIRECTLY                      ****|
- |****                                                              ****|
- +======================================================================+
- | TEMPLATE FILE: readme-md-template.md                                 |
- | commons-build-plugin/trunk/src/main/resources/commons-xdoc-templates |
- +======================================================================+
- |                                                                      |
- | 1) Re-generate using: mvn commons-build:readme-md                    |
- |                                                                      |
- | 2) Set the following properties in the component's pom:              |
- |    - commons.componentid (required, alphabetic, lower case)          |
- |    - commons.release.version (required)                              |
- |                                                                      |
- | 3) Example Properties                                                |
- |                                                                      |
- |  <properties>                                                        |
- |    <commons.componentid>math</commons.componentid>                   |
- |    <commons.release.version>1.2</commons.release.version>            |
- |  </properties>                                                       |
- |                                                                      |
- +======================================================================+
---->
-Apache Commons Numbers Complex Streams
-===================
-
-[![Build Status](https://travis-ci.org/apache/commons-numbers.svg)](https://travis-ci.org/apache/commons-numbers)
-[![Coverage Status](https://coveralls.io/repos/apache/commons-numbers/badge.svg)](https://coveralls.io/r/apache/commons-numbers)
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-numbers-complex-streams/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.apache.commons/commons-numbers-complex-streams/)
-[![Javadocs](https://javadoc.io/badge/org.apache.commons/commons-numbers-complex-streams/1.0-beta1.svg)](https://javadoc.io/doc/org.apache.commons/commons-numbers-complex-streams/1.0-beta1)
-
-Arrays, streams and collections of complex numbers.
-
-Documentation
--------------
-
-More information can be found on the [Apache Commons Numbers homepage](https://commons.apache.org/proper/commons-numbers).
-The [Javadoc](https://commons.apache.org/proper/commons-numbers/commons-numbers-complex-streams/apidocs) can be browsed.
-Questions related to the usage of Apache Commons Numbers should be posted to the [user mailing list][ml].
-
-Where can I get the latest release?
------------------------------------
-You can download source and binaries from our [download page](https://commons.apache.org/proper/commons-numbers/download_numbers.cgi).
-
-Alternatively you can pull it from the central Maven repositories:
-
-```xml
-<dependency>
-  <groupId>org.apache.commons</groupId>
-  <artifactId>commons-numbers-complex-streams</artifactId>
-  <version>1.0</version>
-</dependency>
-```
-
-Contributing
-------------
-
-We accept Pull Requests via GitHub. The [developer mailing list][ml] is the main channel of communication for contributors.
-There are some guidelines which will make applying PRs easier for us:
-+ No tabs! Please use spaces for indentation.
-+ Respect the code style.
-+ Create minimal diffs - disable on save actions like reformat source code or organize imports. If you feel the source code should be reformatted create a separate PR for this change.
-+ Provide JUnit tests for your changes and make sure your changes don't break any existing tests by running ```mvn clean test```.
-
-If you plan to contribute on a regular basis, please consider filing a [contributor license agreement](https://www.apache.org/licenses/#clas).
-You can learn more about contributing via GitHub in our [contribution guidelines](CONTRIBUTING.md).
-
-License
--------
-This code is under the [Apache Licence v2](https://www.apache.org/licenses/LICENSE-2.0).
-
-See the `NOTICE` file for required notices and attributions.
-
-Donations
----------
-You like Apache Commons Numbers? Then [donate back to the ASF](https://www.apache.org/foundation/contributing.html) to support the development.
-
-Additional Resources
---------------------
-
-+ [Apache Commons Homepage](https://commons.apache.org/)
-+ [Apache Issue Tracker (JIRA)](https://issues.apache.org/jira/browse/NUMBERS)
-+ [Apache Commons Twitter Account](https://twitter.com/ApacheCommons)
-+ `#apache-commons` IRC channel on `irc.freenode.org`
-
-[ml]:https://commons.apache.org/mail-lists.html
diff --git a/commons-numbers-complex-streams/pom.xml b/commons-numbers-complex-streams/pom.xml
deleted file mode 100644
index 4478fca..0000000
--- a/commons-numbers-complex-streams/pom.xml
+++ /dev/null
@@ -1,65 +0,0 @@
-<?xml version="1.0"?>
-<!--
-   Licensed to the Apache Software Foundation (ASF) under one or more
-   contributor license agreements.  See the NOTICE file distributed with
-   this work for additional information regarding copyright ownership.
-   The ASF licenses this file to You under the Apache License, Version 2.0
-   (the "License"); you may not use this file except in compliance with
-   the License.  You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
--->
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
-         xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-  <modelVersion>4.0.0</modelVersion>
-
-  <parent>
-    <groupId>org.apache.commons</groupId>
-    <artifactId>commons-numbers-parent</artifactId>
-    <version>1.0</version>
-  </parent>
-
-  <artifactId>commons-numbers-complex-streams</artifactId>
-  <name>Apache Commons Numbers Complex Streams</name>
-
-  <description>Arrays, streams and collections of complex numbers.</description>
-
-  <properties>
-    <!-- The Java Module System Name -->
-    <commons.module.name>org.apache.commons.numbers.complex.streams</commons.module.name>
-    <!-- This value must reflect the current name of the base package. -->
-    <commons.osgi.symbolicName>org.apache.commons.numbers.complex.streams</commons.osgi.symbolicName>
-    <!-- OSGi -->
-    <commons.osgi.export>org.apache.commons.numbers.complex.streams</commons.osgi.export>
-    <!-- Workaround to avoid duplicating config files. -->
-    <numbers.parent.dir>${basedir}/..</numbers.parent.dir>
-  </properties>
-
-  <dependencies>
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-numbers-complex</artifactId>
-    </dependency>
-
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-numbers-core</artifactId>
-      <scope>test</scope>
-    </dependency>
-
-    <dependency>
-      <groupId>org.apache.commons</groupId>
-      <artifactId>commons-math3</artifactId>
-      <scope>test</scope>
-    </dependency>
-
-  </dependencies>
-
-</project>
diff --git a/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/ComplexUtils.java b/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/ComplexUtils.java
deleted file mode 100644
index fcd1975..0000000
--- a/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/ComplexUtils.java
+++ /dev/null
@@ -1,1624 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.numbers.complex.streams;
-
-import org.apache.commons.numbers.complex.Complex;
-
-/**
- * Static implementations of common {@link Complex} utilities functions.
- */
-public final class ComplexUtils {
-    /** Dimension X. */
-    private static final int DIM_X = 0;
-    /** Dimension Y. */
-    private static final int DIM_Y = 1;
-    /** Dimension Z. */
-    private static final int DIM_Z = 2;
-
-    /**
-     * Utility class.
-     */
-    private ComplexUtils() {}
-
-    /**
-     * Creates a complex number from the given polar representation.
-     * <p>
-     * If either {@code r} or {@code theta} is NaN, or {@code theta} is
-     * infinite, {@code Complex(NaN, NaN)} is returned.
-     * <p>
-     * If {@code r} is infinite and {@code theta} is finite, infinite or NaN
-     * values may be returned in parts of the result, following the rules for
-     * double arithmetic.
-     *
-     * Examples:
-     * <pre>
-     * {@code
-     * polar2Complex(INFINITY, \(\pi\)) = INFINITY + INFINITY i
-     * polar2Complex(INFINITY, 0) = INFINITY + NaN i
-     * polar2Complex(INFINITY, \(-\frac{\pi}{4}\)) = INFINITY - INFINITY i
-     * polar2Complex(INFINITY, \(5\frac{\pi}{4}\)) = -INFINITY - INFINITY i }
-     * </pre>
-     *
-     * @param r the modulus of the complex number to create
-     * @param theta the argument of the complex number to create
-     * @return {@code Complex}
-     * @throws IllegalArgumentException if {@code r} is negative
-     */
-    public static Complex polar2Complex(double r, double theta) {
-        if (r < 0) {
-            throw new NegativeModulusException(r);
-        }
-        return Complex.ofCartesian(r * Math.cos(theta), r * Math.sin(theta));
-    }
-
-    /**
-     * Creates {@code Complex[]} array given {@code double[]} arrays of r and
-     * theta.
-     *
-     * @param r {@code double[]} of moduli
-     * @param theta {@code double[]} of arguments
-     * @return {@code Complex[]}
-     * @throws IllegalArgumentException if any element in {@code r} is negative
-     */
-    public static Complex[] polar2Complex(double[] r, double[] theta) {
-        final int length = r.length;
-        final Complex[] c = new Complex[length];
-        for (int x = 0; x < length; x++) {
-            if (r[x] < 0) {
-                throw new NegativeModulusException(r[x]);
-            }
-            c[x] = Complex.ofCartesian(r[x] * Math.cos(theta[x]), r[x] * Math.sin(theta[x]));
-        }
-        return c;
-    }
-
-    /**
-     * Creates {@code Complex[][]} array given {@code double[][]} arrays of r
-     * and theta.
-     *
-     * @param r {@code double[]} of moduli
-     * @param theta {@code double[]} of arguments
-     * @return {@code Complex[][]}
-     * @throws IllegalArgumentException if any element in {@code r} is negative
-     */
-    public static Complex[][] polar2Complex(double[][] r, double[][] theta) {
-        final int length = r.length;
-        final Complex[][] c = new Complex[length][];
-        for (int x = 0; x < length; x++) {
-            c[x] = polar2Complex(r[x], theta[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Creates {@code Complex[][][]} array given {@code double[][][]} arrays of
-     * r and theta.
-     *
-     * @param r array of moduli
-     * @param theta array of arguments
-     * @return {@code Complex}
-     * @throws IllegalArgumentException if any element in {@code r} is negative
-     */
-    public static Complex[][][] polar2Complex(double[][][] r, double[][][] theta) {
-        final int length = r.length;
-        final Complex[][][] c = new Complex[length][][];
-        for (int x = 0; x < length; x++) {
-            c[x] = polar2Complex(r[x], theta[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Returns double from array {@code real[]} at entry {@code index} as a
-     * {@code Complex}.
-     *
-     * @param real array of real numbers
-     * @param index location in the array
-     * @return {@code Complex}.
-     */
-    public static Complex extractComplexFromRealArray(double[] real, int index) {
-        return Complex.ofCartesian(real[index], 0);
-    }
-
-    /**
-     * Returns float from array {@code real[]} at entry {@code index} as a
-     * {@code Complex}.
-     *
-     * @param real array of real numbers
-     * @param index location in the array
-     * @return {@code Complex} array
-     */
-    public static Complex extractComplexFromRealArray(float[] real, int index) {
-        return Complex.ofCartesian(real[index], 0);
-    }
-
-    /**
-     * Returns double from array {@code imaginary[]} at entry {@code index} as a
-     * {@code Complex}.
-     *
-     * @param imaginary array of imaginary numbers
-     * @param index location in the array
-     * @return {@code Complex} array
-     */
-    public static Complex extractComplexFromImaginaryArray(double[] imaginary, int index) {
-        return Complex.ofCartesian(0, imaginary[index]);
-    }
-
-    /**
-     * Returns float from array {@code imaginary[]} at entry {@code index} as a
-     * {@code Complex}.
-     *
-     * @param imaginary array of imaginary numbers
-     * @param index location in the array
-     * @return {@code Complex} array
-     */
-    public static Complex extractComplexFromImaginaryArray(float[] imaginary, int index) {
-        return Complex.ofCartesian(0, imaginary[index]);
-    }
-
-    /**
-     * Returns real component of Complex from array {@code Complex[]} at entry
-     * {@code index} as a {@code double}.
-     *
-     * @param complex array of complex numbers
-     * @param index location in the array
-     * @return {@code double}.
-     */
-    public static double extractRealFromComplexArray(Complex[] complex, int index) {
-        return complex[index].getReal();
-    }
-
-    /**
-     * Returns real component of array {@code Complex[]} at entry {@code index}
-     * as a {@code float}.
-     *
-     * @param complex array of complex numbers
-     * @param index location in the array
-     * @return {@code float}.
-     */
-    public static float extractRealFloatFromComplexArray(Complex[] complex, int index) {
-        return (float) complex[index].getReal();
-    }
-
-    /**
-     * Returns imaginary component of Complex from array {@code Complex[]} at
-     * entry {@code index} as a {@code double}.
-     *
-     * @param complex array of complex numbers
-     * @param index location in the array
-     * @return {@code double}.
-     */
-    public static double extractImaginaryFromComplexArray(Complex[] complex, int index) {
-        return complex[index].getImaginary();
-    }
-
-    /**
-     * Returns imaginary component of array {@code Complex[]} at entry
-     * {@code index} as a {@code float}.
-     *
-     * @param complex array of complex numbers
-     * @param index location in the array
-     * @return {@code float}.
-     */
-    public static float extractImaginaryFloatFromComplexArray(Complex[] complex, int index) {
-        return (float) complex[index].getImaginary();
-    }
-
-    /**
-     * Returns a Complex object from interleaved {@code double[]} array at entry
-     * {@code index}.
-     *
-     * @param d array of interleaved complex numbers alternating real and imaginary values
-     * @param index location in the array This is the location by complex number, e.g. index number 5 in the
-     *      array will return {@code Complex.ofCartesian(d[10], d[11])}
-     * @return {@code Complex}.
-     */
-    public static Complex extractComplexFromInterleavedArray(double[] d, int index) {
-        return Complex.ofCartesian(d[index * 2], d[index * 2 + 1]);
-    }
-
-    /**
-     * Returns a Complex object from interleaved {@code float[]} array at entry
-     * {@code index}.
-     *
-     * @param f float array of interleaved complex numbers alternating real and imaginary values
-     * @param index location in the array This is the location by complex number, e.g. index number 5
-     *      in the {@code float[]} array will return new {@code Complex(d[10], d[11])}
-     * @return {@code Complex}.
-     */
-    public static Complex extractComplexFromInterleavedArray(float[] f, int index) {
-        return Complex.ofCartesian(f[index * 2], f[index * 2 + 1]);
-    }
-
-    /**
-     * Returns values of Complex object from array {@code Complex[]} at entry
-     * {@code index} as a size 2 {@code double} of the form {real, imag}.
-     *
-     * @param complex array of complex numbers
-     * @param index location in the array
-     * @return size 2 array.
-     */
-    public static double[] extractInterleavedFromComplexArray(Complex[] complex, int index) {
-        return new double[] {complex[index].getReal(), complex[index].getImaginary()};
-    }
-
-    /**
-     * Returns Complex object from array {@code Complex[]} at entry
-     * {@code index} as a size 2 {@code float} of the form {real, imag}.
-     *
-     * @param complex {@code Complex} array
-     * @param index location in the array
-     * @return size 2 {@code float[]}.
-     */
-    public static float[] extractInterleavedFloatFromComplexArray(Complex[] complex, int index) {
-        return new float[] {(float) complex[index].getReal(), (float) complex[index].getImaginary()};
-    }
-
-    /**
-     * Converts a {@code double[]} array to a {@code Complex[]} array.
-     *
-     * @param real array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] real2Complex(double[] real) {
-        int index = 0;
-        final Complex[] c = new Complex[real.length];
-        for (final double d : real) {
-            c[index] = Complex.ofCartesian(d, 0);
-            index++;
-        }
-        return c;
-    }
-
-    /**
-     * Converts a {@code float[]} array to a {@code Complex[]} array.
-     *
-     * @param real array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] real2Complex(float[] real) {
-        int index = 0;
-        final Complex[] c = new Complex[real.length];
-        for (final float d : real) {
-            c[index] = Complex.ofCartesian(d, 0);
-            index++;
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D real {@code double[][]} array to a 2D {@code Complex[][]}
-     * array.
-     *
-     * @param d 2D array
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] real2Complex(double[][] d) {
-        final int w = d.length;
-        final Complex[][] c = new Complex[w][];
-        for (int n = 0; n < w; n++) {
-            c[n] = ComplexUtils.real2Complex(d[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D real {@code float[][]} array to a 2D {@code Complex[][]}
-     * array.
-     *
-     * @param d 2D array
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] real2Complex(float[][] d) {
-        final int w = d.length;
-        final Complex[][] c = new Complex[w][];
-        for (int n = 0; n < w; n++) {
-            c[n] = ComplexUtils.real2Complex(d[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D real {@code double[][][]} array to a {@code Complex [][][]}
-     * array.
-     *
-     * @param d 3D complex interleaved array
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] real2Complex(double[][][] d) {
-        final int w = d.length;
-        final Complex[][][] c = new Complex[w][][];
-        for (int x = 0; x < w; x++) {
-            c[x] = ComplexUtils.real2Complex(d[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D real {@code float[][][]} array to a {@code Complex [][][]}
-     * array.
-     *
-     * @param d 3D complex interleaved array
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] real2Complex(float[][][] d) {
-        final int w = d.length;
-        final Complex[][][] c = new Complex[w][][];
-        for (int x = 0; x < w; x++) {
-            c[x] = ComplexUtils.real2Complex(d[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 4D real {@code double[][][][]} array to a {@code Complex [][][][]}
-     * array.
-     *
-     * @param d 4D complex interleaved array
-     * @return 4D {@code Complex} array
-     */
-    public static Complex[][][][] real2Complex(double[][][][] d) {
-        final int w = d.length;
-        final Complex[][][][] c = new Complex[w][][][];
-        for (int x = 0; x < w; x++) {
-            c[x] = ComplexUtils.real2Complex(d[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts real component of {@code Complex[]} array to a {@code double[]}
-     * array.
-     *
-     * @param c {@code Complex} array
-     * @return array of the real component
-     */
-    public static double[] complex2Real(Complex[] c) {
-        int index = 0;
-        final double[] d = new double[c.length];
-        for (final Complex cc : c) {
-            d[index] = cc.getReal();
-            index++;
-        }
-        return d;
-    }
-
-    /**
-     * Converts real component of {@code Complex[]} array to a {@code float[]}
-     * array.
-     *
-     * @param c {@code Complex} array
-     * @return {@code float[]} array of the real component
-     */
-    public static float[] complex2RealFloat(Complex[] c) {
-        int index = 0;
-        final float[] f = new float[c.length];
-        for (final Complex cc : c) {
-            f[index] = (float) cc.getReal();
-            index++;
-        }
-        return f;
-    }
-
-    /**
-     * Converts real component of a 2D {@code Complex[][]} array to a 2D
-     * {@code double[][]} array.
-     *
-     * @param c 2D {@code Complex} array
-     * @return {@code double[][]} of real component
-     */
-    public static double[][] complex2Real(Complex[][] c) {
-        final int length = c.length;
-        final double[][] d = new double[length][];
-        for (int n = 0; n < length; n++) {
-            d[n] = complex2Real(c[n]);
-        }
-        return d;
-    }
-
-    /**
-     * Converts real component of a 2D {@code Complex[][]} array to a 2D
-     * {@code float[][]} array.
-     *
-     * @param c 2D {@code Complex} array
-     * @return {@code float[][]} of real component
-     */
-    public static float[][] complex2RealFloat(Complex[][] c) {
-        final int length = c.length;
-        final float[][] f = new float[length][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2RealFloat(c[n]);
-        }
-        return f;
-    }
-
-    /**
-     * Converts real component of a 3D {@code Complex[][][]} array to a 3D
-     * {@code double[][][]} array.
-     *
-     * @param c 3D complex interleaved array
-     * @return array of real component
-     */
-    public static double[][][] complex2Real(Complex[][][] c) {
-        final int length = c.length;
-        final double[][][] d = new double[length][][];
-        for (int n = 0; n < length; n++) {
-            d[n] = complex2Real(c[n]);
-        }
-        return d;
-    }
-
-    /**
-     * Converts real component of a 3D {@code Complex[][][]} array to a 3D
-     * {@code float[][][]} array.
-     *
-     * @param c 3D {@code Complex} array
-     * @return {@code float[][][]} of real component
-     */
-    public static float[][][] complex2RealFloat(Complex[][][] c) {
-        final int length = c.length;
-        final float[][][] f = new float[length][][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2RealFloat(c[n]);
-        }
-        return f;
-    }
-
-    /**
-     * Converts real component of a 4D {@code Complex[][][][]} array to a 4D
-     * {@code double[][][][]} array.
-     *
-     * @param c 4D complex interleaved array
-     * @return array of real component
-     */
-    public static double[][][][] complex2Real(Complex[][][][] c) {
-        final int length = c.length;
-        final double[][][][] d = new double[length][][][];
-        for (int n = 0; n < length; n++) {
-            d[n] = complex2Real(c[n]);
-        }
-        return d;
-    }
-
-    /**
-     * Converts real component of a 4D {@code Complex[][][][]} array to a 4D
-     * {@code float[][][][]} array.
-     *
-     * @param c 4D {@code Complex} array
-     * @return {@code float[][][][]} of real component
-     */
-    public static float[][][][] complex2RealFloat(Complex[][][][] c) {
-        final int length = c.length;
-        final float[][][][] f = new float[length][][][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2RealFloat(c[n]);
-        }
-        return f;
-    }
-
-    /**
-     * Converts a {@code double[]} array to an imaginary {@code Complex[]}
-     * array.
-     *
-     * @param imaginary array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] imaginary2Complex(double[] imaginary) {
-        int index = 0;
-        final Complex[] c = new Complex[imaginary.length];
-        for (final double d : imaginary) {
-            c[index] = Complex.ofCartesian(0, d);
-            index++;
-        }
-        return c;
-    }
-
-    /**
-     * Converts a {@code float[]} array to an imaginary {@code Complex[]} array.
-     *
-     * @param imaginary array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] imaginary2Complex(float[] imaginary) {
-        int index = 0;
-        final Complex[] c = new Complex[imaginary.length];
-        for (final float d : imaginary) {
-            c[index] = Complex.ofCartesian(0, d);
-            index++;
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D imaginary array {@code double[][]} to a 2D
-     * {@code Complex[][]} array.
-     *
-     * @param i 2D array
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] imaginary2Complex(double[][] i) {
-        final int w = i.length;
-        final Complex[][] c = new Complex[w][];
-        for (int n = 0; n < w; n++) {
-            c[n] = ComplexUtils.imaginary2Complex(i[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D imaginary array {@code double[][][]} to a {@code Complex[]}
-     * array.
-     *
-     * @param i 3D complex imaginary array
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] imaginary2Complex(double[][][] i) {
-        final int w = i.length;
-        final Complex[][][] c = new Complex[w][][];
-        for (int n = 0; n < w; n++) {
-            c[n] = ComplexUtils.imaginary2Complex(i[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 4D imaginary array {@code double[][][][]} to a 4D {@code Complex[][][][]}
-     * array.
-     *
-     * @param i 4D complex imaginary array
-     * @return 4D {@code Complex} array
-     */
-    public static Complex[][][][] imaginary2Complex(double[][][][] i) {
-        final int w = i.length;
-        final Complex[][][][] c = new Complex[w][][][];
-        for (int n = 0; n < w; n++) {
-            c[n] = ComplexUtils.imaginary2Complex(i[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts imaginary part of a {@code Complex[]} array to a
-     * {@code double[]} array.
-     *
-     * @param c {@code Complex} array.
-     * @return array of the imaginary component
-     */
-    public static double[] complex2Imaginary(Complex[] c) {
-        int index = 0;
-        final double[] i = new double[c.length];
-        for (final Complex cc : c) {
-            i[index] = cc.getImaginary();
-            index++;
-        }
-        return i;
-    }
-
-    /**
-     * Converts imaginary component of a {@code Complex[]} array to a
-     * {@code float[]} array.
-     *
-     * @param c {@code Complex} array.
-     * @return {@code float[]} array of the imaginary component
-     */
-    public static float[] complex2ImaginaryFloat(Complex[] c) {
-        int index = 0;
-        final float[] f = new float[c.length];
-        for (final Complex cc : c) {
-            f[index] = (float) cc.getImaginary();
-            index++;
-        }
-        return f;
-    }
-
-    /**
-     * Converts imaginary component of a 2D {@code Complex[][]} array to a 2D
-     * {@code double[][]} array.
-     *
-     * @param c 2D {@code Complex} array
-     * @return {@code double[][]} of imaginary component
-     */
-    public static double[][] complex2Imaginary(Complex[][] c) {
-        final int length = c.length;
-        final double[][] i = new double[length][];
-        for (int n = 0; n < length; n++) {
-            i[n] = complex2Imaginary(c[n]);
-        }
-        return i;
-    }
-
-    /**
-     * Converts imaginary component of a 2D {@code Complex[][]} array to a 2D
-     * {@code float[][]} array.
-     *
-     * @param c 2D {@code Complex} array
-     * @return {@code float[][]} of imaginary component
-     */
-    public static float[][] complex2ImaginaryFloat(Complex[][] c) {
-        final int length = c.length;
-        final float[][] f = new float[length][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2ImaginaryFloat(c[n]);
-        }
-        return f;
-    }
-
-    /**
-     * Converts imaginary component of a 3D {@code Complex[][][]} array to a 3D
-     * {@code double[][][]} array.
-     *
-     * @param c 3D complex interleaved array
-     * @return 3D {@code Complex} array
-     */
-    public static double[][][] complex2Imaginary(Complex[][][] c) {
-        final int length = c.length;
-        final double[][][] i = new double[length][][];
-        for (int n = 0; n < length; n++) {
-            i[n] = complex2Imaginary(c[n]);
-        }
-        return i;
-    }
-
-    /**
-     * Converts imaginary component of a 3D {@code Complex[][][]} array to a 3D
-     * {@code float[][][]} array.
-     *
-     * @param c 3D {@code Complex} array
-     * @return {@code float[][][]} of imaginary component
-     */
-    public static float[][][] complex2ImaginaryFloat(Complex[][][] c) {
-        final int length = c.length;
-        final float[][][] f = new float[length][][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2ImaginaryFloat(c[n]);
-        }
-        return f;
-    }
-
-    /**
-     * Converts imaginary component of a 4D {@code Complex[][][][]} array to a 4D
-     * {@code double[][][][]} array.
-     *
-     * @param c 4D complex interleaved array
-     * @return 4D {@code Complex} array
-     */
-    public static double[][][][] complex2Imaginary(Complex[][][][] c) {
-        final int length = c.length;
-        final double[][][][] i = new double[length][][][];
-        for (int n = 0; n < length; n++) {
-            i[n] = complex2Imaginary(c[n]);
-        }
-        return i;
-    }
-
-    /**
-     * Converts imaginary component of a 4D {@code Complex[][][][]} array to a 4D
-     * {@code float[][][][]} array.
-     *
-     * @param c 4D {@code Complex} array
-     * @return {@code float[][][][]} of imaginary component
-     */
-    public static float[][][][] complex2ImaginaryFloat(Complex[][][][] c) {
-        final int length = c.length;
-        final float[][][][] f = new float[length][][][];
-        for (int n = 0; n < length; n++) {
-            f[n] = complex2ImaginaryFloat(c[n]);
-        }
-        return f;
-    }
-
-    // INTERLEAVED METHODS
-
-    /**
-     * Converts a complex interleaved {@code double[]} array to a
-     * {@code Complex[]} array.
-     *
-     * @param interleaved array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] interleaved2Complex(double[] interleaved) {
-        final int length = interleaved.length / 2;
-        final Complex[] c = new Complex[length];
-        for (int n = 0; n < length; n++) {
-            c[n] = Complex.ofCartesian(interleaved[n * 2], interleaved[n * 2 + 1]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a complex interleaved {@code float[]} array to a
-     * {@code Complex[]} array.
-     *
-     * @param interleaved float[] array of numbers to be converted to their {@code Complex} equivalent
-     * @return {@code Complex} array
-     */
-    public static Complex[] interleaved2Complex(float[] interleaved) {
-        final int length = interleaved.length / 2;
-        final Complex[] c = new Complex[length];
-        for (int n = 0; n < length; n++) {
-            c[n] = Complex.ofCartesian(interleaved[n * 2], interleaved[n * 2 + 1]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a {@code Complex[]} array to an interleaved complex
-     * {@code double[]} array.
-     *
-     * @param c Complex array
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     */
-    public static double[] complex2Interleaved(Complex[] c) {
-        int index = 0;
-        final double[] i = new double[c.length * 2];
-        for (final Complex cc : c) {
-            final int real = index * 2;
-            final int imag = index * 2 + 1;
-            i[real] = cc.getReal();
-            i[imag] = cc.getImaginary();
-            index++;
-        }
-        return i;
-    }
-
-    /**
-     * Converts a {@code Complex[]} array to an interleaved complex
-     * {@code float[]} array.
-     *
-     * @param c Complex array
-     * @return complex interleaved {@code float[]} alternating real and
-     *         imaginary values
-     */
-    public static float[] complex2InterleavedFloat(Complex[] c) {
-        int index = 0;
-        final float[] f = new float[c.length * 2];
-        for (final Complex cc : c) {
-            final int real = index * 2;
-            final int imag = index * 2 + 1;
-            f[real] = (float) cc.getReal();
-            f[imag] = (float) cc.getImaginary();
-            index++;
-        }
-        return f;
-    }
-
-    /**
-     * Converts a 2D {@code Complex[][]} array to an interleaved complex
-     * {@code double[][]} array.
-     *
-     * @param c 2D Complex array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0 or 1
-     */
-    public static double[][] complex2Interleaved(Complex[][] c, int interleavedDim) {
-        if (interleavedDim > 1 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = c.length;
-        final int h = c[0].length;
-        double[][] i;
-        if (interleavedDim == 0) {
-            i = new double[2 * w][h];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    i[x * 2][y] = c[x][y].getReal();
-                    i[x * 2 + 1][y] = c[x][y].getImaginary();
-                }
-            }
-        } else {
-            i = new double[w][2 * h];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    i[x][y * 2] = c[x][y].getReal();
-                    i[x][y * 2 + 1] = c[x][y].getImaginary();
-                }
-            }
-        }
-        return i;
-    }
-
-    /**
-     * Converts a 2D {@code Complex[][]} array to an interleaved complex
-     * {@code double[][]} array. The second d level of the array is assumed
-     * to be interleaved.
-     *
-     * @param c 2D Complex array
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     */
-    public static double[][] complex2Interleaved(Complex[][] c) {
-        return complex2Interleaved(c, 1);
-    }
-
-    /**
-     * Converts a 3D {@code Complex[][][]} array to an interleaved complex
-     * {@code double[][][]} array.
-     *
-     * @param c 3D Complex array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0, 1, or 2
-     */
-    public static double[][][] complex2Interleaved(Complex[][][] c, int interleavedDim) {
-        if (interleavedDim > 2 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = c.length;
-        final int h = c[0].length;
-        final int d = c[0][0].length;
-        double[][][] i;
-        if (interleavedDim == 0) {
-            i = new double[2 * w][h][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x * 2][y][z] = c[x][y][z].getReal();
-                        i[x * 2 + 1][y][z] = c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        } else if (interleavedDim == 1) {
-            i = new double[w][2 * h][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x][y * 2][z] = c[x][y][z].getReal();
-                        i[x][y * 2 + 1][z] = c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        } else {
-            i = new double[w][h][2 * d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x][y][z * 2] = c[x][y][z].getReal();
-                        i[x][y][z * 2 + 1] = c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        }
-        return i;
-    }
-
-    /**
-     * Converts a 4D {@code Complex[][][][]} array to an interleaved complex
-     * {@code double[][][][]} array.
-     *
-     * @param c 4D Complex array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     * @throws IllegalArgumentException if {@code interleavedDim} is not in the range {@code [0, 3]}
-     */
-    public static double[][][][] complex2Interleaved(Complex[][][][] c, int interleavedDim) {
-        if (interleavedDim > 3 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = c.length;
-        final int h = c[0].length;
-        final int d = c[0][0].length;
-        final int v = c[0][0][0].length;
-        double[][][][] i;
-        if (interleavedDim == DIM_X) {
-            i = new double[2 * w][h][d][v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            i[x * 2][y][z][t] = c[x][y][z][t].getReal();
-                            i[x * 2 + 1][y][z][t] = c[x][y][z][t].getImaginary();
-                        }
-                    }
-                }
-            }
-        } else if (interleavedDim == DIM_Y) {
-            i = new double[w][2 * h][d][v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            i[x][y * 2][z][t] = c[x][y][z][t].getReal();
-                            i[x][y * 2 + 1][z][t] = c[x][y][z][t].getImaginary();
-                        }
-                    }
-                }
-            }
-        } else if (interleavedDim == DIM_Z) {
-            i = new double[w][h][2 * d][v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            i[x][y][z * 2][t] = c[x][y][z][t].getReal();
-                            i[x][y][z * 2 + 1][t] = c[x][y][z][t].getImaginary();
-                        }
-                    }
-                }
-            }
-        } else {
-            i = new double[w][h][d][2 * v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            i[x][y][z][t * 2] = c[x][y][z][t].getReal();
-                            i[x][y][z][t * 2 + 1] = c[x][y][z][t].getImaginary();
-                        }
-                    }
-                }
-            }
-        }
-        return i;
-    }
-
-    /**
-     * Converts a 3D {@code Complex[][][]} array to an interleaved complex
-     * {@code double[][][]} array. The third level of the array is
-     * interleaved.
-     *
-     * @param c 3D Complex array
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     */
-    public static double[][][] complex2Interleaved(Complex[][][] c) {
-        return complex2Interleaved(c, 2);
-    }
-
-    /**
-     * Converts a 4D {@code Complex[][][][]} array to an interleaved complex
-     * {@code double[][][][]} array. The fourth level of the array is
-     * interleaved.
-     *
-     * @param c 4D Complex array
-     * @return complex interleaved array alternating real and
-     *         imaginary values
-     */
-    public static double[][][][] complex2Interleaved(Complex[][][][] c) {
-        return complex2Interleaved(c, 3);
-    }
-
-    /**
-     * Converts a 2D {@code Complex[][]} array to an interleaved complex
-     * {@code float[][]} array.
-     *
-     * @param c 2D Complex array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return complex interleaved {@code float[][]} alternating real and
-     *         imaginary values
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0 or 1
-     */
-    public static float[][] complex2InterleavedFloat(Complex[][] c, int interleavedDim) {
-        if (interleavedDim > 1 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = c.length;
-        final int h = c[0].length;
-        float[][] i;
-        if (interleavedDim == 0) {
-            i = new float[2 * w][h];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    i[x * 2][y] = (float) c[x][y].getReal();
-                    i[x * 2 + 1][y] = (float) c[x][y].getImaginary();
-                }
-            }
-        } else {
-            i = new float[w][2 * h];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    i[x][y * 2] = (float) c[x][y].getReal();
-                    i[x][y * 2 + 1] = (float) c[x][y].getImaginary();
-                }
-            }
-        }
-        return i;
-    }
-
-    /**
-     * Converts a 2D {@code Complex[][]} array to an interleaved complex
-     * {@code float[][]} array. The second d level of the array is assumed
-     * to be interleaved.
-     *
-     * @param c 2D Complex array
-     *
-     * @return complex interleaved {@code float[][]} alternating real and
-     *         imaginary values
-     */
-    public static float[][] complex2InterleavedFloat(Complex[][] c) {
-        return complex2InterleavedFloat(c, 1);
-    }
-
-    /**
-     * Converts a 3D {@code Complex[][][]} array to an interleaved complex
-     * {@code float[][][]} array.
-     *
-     * @param c 3D Complex array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return complex interleaved {@code float[][][]} alternating real and
-     *         imaginary values
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0, 1, or 2
-     */
-    public static float[][][] complex2InterleavedFloat(Complex[][][] c, int interleavedDim) {
-        if (interleavedDim > 2 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = c.length;
-        final int h = c[0].length;
-        final int d = c[0][0].length;
-        float[][][] i;
-        if (interleavedDim == 0) {
-            i = new float[2 * w][h][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x * 2][y][z] = (float) c[x][y][z].getReal();
-                        i[x * 2 + 1][y][z] = (float) c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        } else if (interleavedDim == 1) {
-            i = new float[w][2 * h][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x][y * 2][z] = (float) c[x][y][z].getReal();
-                        i[x][y * 2 + 1][z] = (float) c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        } else {
-            i = new float[w][h][2 * d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        i[x][y][z * 2] = (float) c[x][y][z].getReal();
-                        i[x][y][z * 2 + 1] = (float) c[x][y][z].getImaginary();
-                    }
-                }
-            }
-        }
-        return i;
-    }
-
-    /**
-     * Converts a 3D {@code Complex[][][]} array to an interleaved complex
-     * {@code float[][][]} array. The third d level of the array is
-     * interleaved.
-     *
-     * @param c 2D Complex array
-     *
-     * @return complex interleaved {@code float[][][]} alternating real and
-     *         imaginary values
-     */
-    public static float[][][] complex2InterleavedFloat(Complex[][][] c) {
-        return complex2InterleavedFloat(c, 2);
-    }
-
-    /**
-     * Converts a 2D interleaved complex {@code double[][]} array to a
-     * {@code Complex[][]} array.
-     *
-     * @param i 2D complex interleaved array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return 2D {@code Complex} array
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0 or 1
-     */
-    public static Complex[][] interleaved2Complex(double[][] i, int interleavedDim) {
-        if (interleavedDim > 1 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = i.length;
-        final int h = i[0].length;
-        Complex[][] c;
-        if (interleavedDim == 0) {
-            c = new Complex[w / 2][h];
-            for (int x = 0; x < w / 2; x++) {
-                for (int y = 0; y < h; y++) {
-                    c[x][y] = Complex.ofCartesian(i[x * 2][y], i[x * 2 + 1][y]);
-                }
-            }
-        } else {
-            c = new Complex[w][h / 2];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h / 2; y++) {
-                    c[x][y] = Complex.ofCartesian(i[x][y * 2], i[x][y * 2 + 1]);
-                }
-            }
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D interleaved complex {@code double[][]} array to a
-     * {@code Complex[][]} array. The second d level of the array is assumed
-     * to be interleaved.
-     *
-     * @param d 2D complex interleaved array
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] interleaved2Complex(double[][] d) {
-        return interleaved2Complex(d, 1);
-    }
-
-    /**
-     * Converts a 3D interleaved complex {@code double[][][]} array to a
-     * {@code Complex[][][]} array.
-     *
-     * @param i 3D complex interleaved array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return 3D {@code Complex} array
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0, 1, or 2
-     */
-    public static Complex[][][] interleaved2Complex(double[][][] i, int interleavedDim) {
-        if (interleavedDim > 2 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = i.length;
-        final int h = i[0].length;
-        final int d = i[0][0].length;
-        Complex[][][] c;
-        if (interleavedDim == DIM_X) {
-            c = new Complex[w / 2][h][d];
-            for (int x = 0; x < w / 2; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x * 2][y][z], i[x * 2 + 1][y][z]);
-                    }
-                }
-            }
-        } else if (interleavedDim == DIM_Y) {
-            c = new Complex[w][h / 2][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h / 2; y++) {
-                    for (int z = 0; z < d; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x][y * 2][z], i[x][y * 2 + 1][z]);
-                    }
-                }
-            }
-        } else {
-            c = new Complex[w][h][d / 2];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d / 2; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x][y][z * 2], i[x][y][z * 2 + 1]);
-                    }
-                }
-            }
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 4D interleaved complex {@code double[][][][]} array to a
-     * {@code Complex[][][][]} array.
-     *
-     * @param i 4D complex interleaved array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return 4D {@code Complex} array
-     * @throws IllegalArgumentException if {@code interleavedDim} is not in the range {@code [0, 3]}
-     */
-    public static Complex[][][][] interleaved2Complex(double[][][][] i, int interleavedDim) {
-        if (interleavedDim > 3 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = i.length;
-        final int h = i[0].length;
-        final int d = i[0][0].length;
-        final int v = i[0][0][0].length;
-        Complex[][][][] c;
-        if (interleavedDim == 0) {
-            c = new Complex[w / 2][h][d][v];
-            for (int x = 0; x < w / 2; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            c[x][y][z][t] = Complex.ofCartesian(i[x * 2][y][z][t], i[x * 2 + 1][y][z][t]);
-                        }
-                    }
-                }
-            }
-        } else if (interleavedDim == 1) {
-            c = new Complex[w][h / 2][d][v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h / 2; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v; t++) {
-                            c[x][y][z][t] = Complex.ofCartesian(i[x][y * 2][z][t], i[x][y * 2 + 1][z][t]);
-                        }
-                    }
-                }
-            }
-        } else if (interleavedDim == 2) {
-            c = new Complex[w][h][d / 2][v];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d / 2; z++) {
-                        for (int t = 0; t < v; t++) {
-                            c[x][y][z][t] = Complex.ofCartesian(i[x][y][z * 2][t], i[x][y][z * 2 + 1][t]);
-                        }
-                    }
-                }
-            }
-        } else {
-            c = new Complex[w][h][d][v / 2];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        for (int t = 0; t < v / 2; t++) {
-                            c[x][y][z][t] = Complex.ofCartesian(i[x][y][z][t * 2], i[x][y][z][t * 2 + 1]);
-                        }
-                    }
-                }
-            }
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D interleaved complex {@code double[][][]} array to a
-     * {@code Complex[][][]} array. The third d level is assumed to be
-     * interleaved.
-     *
-     * @param d 3D complex interleaved array
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] interleaved2Complex(double[][][] d) {
-        return interleaved2Complex(d, 2);
-    }
-
-    /**
-     * Converts a 2D interleaved complex {@code float[][]} array to a
-     * {@code Complex[][]} array.
-     *
-     * @param i 2D complex interleaved float array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return 2D {@code Complex} array
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0 or 1
-     */
-    public static Complex[][] interleaved2Complex(float[][] i, int interleavedDim) {
-        if (interleavedDim > 1 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = i.length;
-        final int h = i[0].length;
-        Complex[][] c;
-        if (interleavedDim == 0) {
-            c = new Complex[w / 2][h];
-            for (int x = 0; x < w / 2; x++) {
-                for (int y = 0; y < h; y++) {
-                    c[x][y] = Complex.ofCartesian(i[x * 2][y], i[x * 2 + 1][y]);
-                }
-            }
-        } else {
-            c = new Complex[w][h / 2];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h / 2; y++) {
-                    c[x][y] = Complex.ofCartesian(i[x][y * 2], i[x][y * 2 + 1]);
-                }
-            }
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D interleaved complex {@code float[][]} array to a
-     * {@code Complex[][]} array. The second d level of the array is assumed
-     * to be interleaved.
-     *
-     * @param d 2D complex interleaved float array
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] interleaved2Complex(float[][] d) {
-        return interleaved2Complex(d, 1);
-    }
-
-    /**
-     * Converts a 3D interleaved complex {@code float[][][]} array to a
-     * {@code Complex[][][]} array.
-     *
-     * @param i 3D complex interleaved float array
-     * @param interleavedDim Depth level of the array to interleave
-     * @return 3D {@code Complex} array
-     * @throws IllegalArgumentException if {@code interleavedDim} is not 0, 1, or 2
-     */
-    public static Complex[][][] interleaved2Complex(float[][][] i, int interleavedDim) {
-        if (interleavedDim > 2 || interleavedDim < 0) {
-            throw new IndexOutOfRangeException(interleavedDim);
-        }
-        final int w = i.length;
-        final int h = i[0].length;
-        final int d = i[0][0].length;
-        Complex[][][] c;
-        if (interleavedDim == 0) {
-            c = new Complex[w / 2][h][d];
-            for (int x = 0; x < w / 2; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x * 2][y][z], i[x * 2 + 1][y][z]);
-                    }
-                }
-            }
-        } else if (interleavedDim == 1) {
-            c = new Complex[w][h / 2][d];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h / 2; y++) {
-                    for (int z = 0; z < d; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x][y * 2][z], i[x][y * 2 + 1][z]);
-                    }
-                }
-            }
-        } else {
-            c = new Complex[w][h][d / 2];
-            for (int x = 0; x < w; x++) {
-                for (int y = 0; y < h; y++) {
-                    for (int z = 0; z < d / 2; z++) {
-                        c[x][y][z] = Complex.ofCartesian(i[x][y][z * 2], i[x][y][z * 2 + 1]);
-                    }
-                }
-            }
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D interleaved complex {@code float[][][]} array to a
-     * {@code Complex[]} array. The third level of the array is assumed to
-     * be interleaved.
-     *
-     * @param d 3D complex interleaved float array
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] interleaved2Complex(float[][][] d) {
-        return interleaved2Complex(d, 2);
-    }
-
-    // SPLIT METHODS
-
-    /**
-     * Converts a split complex array {@code double[] r, double[] i} to a
-     * {@code Complex[]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return {@code Complex} array
-     */
-    public static Complex[] split2Complex(double[] real, double[] imag) {
-        final int length = real.length;
-        final Complex[] c = new Complex[length];
-        for (int n = 0; n < length; n++) {
-            c[n] = Complex.ofCartesian(real[n], imag[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D split complex array {@code double[][] r, double[][] i} to a
-     * 2D {@code Complex[][]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] split2Complex(double[][] real, double[][] imag) {
-        final int length = real.length;
-        final Complex[][] c = new Complex[length][];
-        for (int x = 0; x < length; x++) {
-            c[x] = split2Complex(real[x], imag[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D split complex array {@code double[][][] r, double[][][] i}
-     * to a 3D {@code Complex[][][]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] split2Complex(double[][][] real, double[][][] imag) {
-        final int length = real.length;
-        final Complex[][][] c = new Complex[length][][];
-        for (int x = 0; x < length; x++) {
-            c[x] = split2Complex(real[x], imag[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 4D split complex array {@code double[][][][] r, double[][][][] i}
-     * to a 4D {@code Complex[][][][]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return 4D {@code Complex} array
-     */
-    public static Complex[][][][] split2Complex(double[][][][] real, double[][][][] imag) {
-        final int length = real.length;
-        final Complex[][][][] c = new Complex[length][][][];
-        for (int x = 0; x < length; x++) {
-            c[x] = split2Complex(real[x], imag[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a split complex array {@code float[] r, float[] i} to a
-     * {@code Complex[]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return {@code Complex} array
-     */
-    public static Complex[] split2Complex(float[] real, float[] imag) {
-        final int length = real.length;
-        final Complex[] c = new Complex[length];
-        for (int n = 0; n < length; n++) {
-            c[n] = Complex.ofCartesian(real[n], imag[n]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 2D split complex array {@code float[][] r, float[][] i} to a
-     * 2D {@code Complex[][]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return 2D {@code Complex} array
-     */
-    public static Complex[][] split2Complex(float[][] real, float[][] imag) {
-        final int length = real.length;
-        final Complex[][] c = new Complex[length][];
-        for (int x = 0; x < length; x++) {
-            c[x] = split2Complex(real[x], imag[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Converts a 3D split complex array {@code float[][][] r, float[][][] i} to
-     * a 3D {@code Complex[][][]} array.
-     *
-     * @param real real component
-     * @param imag imaginary component
-     * @return 3D {@code Complex} array
-     */
-    public static Complex[][][] split2Complex(float[][][] real, float[][][] imag) {
-        final int length = real.length;
-        final Complex[][][] c = new Complex[length][][];
-        for (int x = 0; x < length; x++) {
-            c[x] = split2Complex(real[x], imag[x]);
-        }
-        return c;
-    }
-
-    // MISC
-
-    /**
-     * Initializes a {@code Complex[]} array to zero, to avoid
-     * NullPointerExceptions.
-     *
-     * @param c Complex array
-     * @return c
-     */
-    public static Complex[] initialize(Complex[] c) {
-        final int length = c.length;
-        for (int x = 0; x < length; x++) {
-            c[x] = Complex.ZERO;
-        }
-        return c;
-    }
-
-    /**
-     * Initializes a {@code Complex[][]} array to zero, to avoid
-     * NullPointerExceptions.
-     *
-     * @param c {@code Complex} array
-     * @return c
-     */
-    public static Complex[][] initialize(Complex[][] c) {
-        final int length = c.length;
-        for (int x = 0; x < length; x++) {
-            c[x] = initialize(c[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Initializes a {@code Complex[][][]} array to zero, to avoid
-     * NullPointerExceptions.
-     *
-     * @param c {@code Complex} array
-     * @return c
-     */
-    public static Complex[][][] initialize(Complex[][][] c) {
-        final int length = c.length;
-        for (int x = 0; x < length; x++) {
-            c[x] = initialize(c[x]);
-        }
-        return c;
-    }
-
-    /**
-     * Returns {@code double[]} containing absolute values (magnitudes) of a
-     * {@code Complex[]} array.
-     *
-     * @param c {@code Complex} array
-     * @return {@code double[]}
-     */
-    public static double[] abs(Complex[] c) {
-        final int length = c.length;
-        final double[] i = new double[length];
-        for (int x = 0; x < length; x++) {
-            i[x] = c[x].abs();
-        }
-        return i;
-    }
-
-    /**
-     * Returns {@code double[]} containing arguments (phase angles) of a
-     * {@code Complex[]} array.
-     *
-     * @param c {@code Complex} array
-     * @return {@code double[]} array
-     */
-    public static double[] arg(Complex[] c) {
-        final int length = c.length;
-        final double[] i = new double[length];
-        for (int x = 0; x < length; x++) {
-            i[x] = c[x].arg();
-        }
-        return i;
-    }
-
-    /**
-     * Exception to be throw when a negative value is passed as the modulus.
-     */
-    private static class NegativeModulusException extends IllegalArgumentException {
-        /** Serializable version identifier. */
-        private static final long serialVersionUID = 20181205L;
-
-        /**
-         * @param r Wrong modulus.
-         */
-        NegativeModulusException(double r) {
-            super("Modulus is negative: " + r);
-        }
-    }
-
-    /**
-     * Exception to be throw when an out-of-range index value is passed.
-     */
-    private static class IndexOutOfRangeException extends IllegalArgumentException {
-        /** Serializable version identifier. */
-        private static final long serialVersionUID = 20181205L;
-
-        /**
-         * @param i Wrong index.
-         */
-        IndexOutOfRangeException(int i) {
-            super("Out of range: " + i);
-        }
-    }
-}
diff --git a/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/package-info.java b/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/package-info.java
deleted file mode 100644
index 0b7c1cd..0000000
--- a/commons-numbers-complex-streams/src/main/java/org/apache/commons/numbers/complex/streams/package-info.java
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/**
- * Complex numbers collections.
- */
-package org.apache.commons.numbers.complex.streams;
diff --git a/commons-numbers-complex-streams/src/site/resources/profile.jacoco b/commons-numbers-complex-streams/src/site/resources/profile.jacoco
deleted file mode 100644
index a12755f..0000000
--- a/commons-numbers-complex-streams/src/site/resources/profile.jacoco
+++ /dev/null
@@ -1,17 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-# -----------------------------------------------------------------------------
-#
-# Empty file used to automatically trigger JaCoCo profile from commons parent pom
diff --git a/commons-numbers-complex-streams/src/site/site.xml b/commons-numbers-complex-streams/src/site/site.xml
deleted file mode 100644
index 5a61c39..0000000
--- a/commons-numbers-complex-streams/src/site/site.xml
+++ /dev/null
@@ -1,35 +0,0 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!--
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements.  See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License.  You may obtain a copy of the License at
-
-      http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
--->
-<project name="Numbers">
-  <bannerRight>
-    <name>Apache Commons Numbers</name>
-    <src>/images/commons_numbers.small.png</src>
-    <href>/index.html</href>
-  </bannerRight>
-
-  <body>
-    <menu name="Numbers Complex Streams">
-      <item name="Overview" href="index.html"/>
-      <item name="Latest API docs (development)"
-            href="apidocs/index.html"/>
-      <!--item name="Javadoc (1.0 release)"
-            href="http://commons.apache.org/rng/commons-numbers-complex-streams/javadocs/api-1.0/index.html"/-->
-    </menu>
-
-  </body>
-</project>
diff --git a/commons-numbers-complex-streams/src/site/xdoc/index.xml b/commons-numbers-complex-streams/src/site/xdoc/index.xml
deleted file mode 100644
index c295d95..0000000
--- a/commons-numbers-complex-streams/src/site/xdoc/index.xml
+++ /dev/null
@@ -1,40 +0,0 @@
-<?xml version="1.0"?>
-
-<!--
-   Licensed to the Apache Software Foundation (ASF) under one or more
-  contributor license agreements.  See the NOTICE file distributed with
-  this work for additional information regarding copyright ownership.
-  The ASF licenses this file to You under the Apache License, Version 2.0
-  (the "License"); you may not use this file except in compliance with
-  the License.  You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-  -->
-
-<document>
-
-  <properties>
-    <title>Commons Numbers Complex</title>
-  </properties>
-
-  <body>
-
-    <section name="Apache Commons Numbers: Number types" href="summary">
-      <p>
-        Commons Numbers provides utilities such as complex numbers and fractions.
-      </p>
-
-      <p>
-        The "complex-stream" module contains...
-      </p>
-    </section>
-
-  </body>
-
-</document>
diff --git a/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/ComplexUtilsTest.java b/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/ComplexUtilsTest.java
deleted file mode 100644
index ffafec5..0000000
--- a/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/ComplexUtilsTest.java
+++ /dev/null
@@ -1,772 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.numbers.complex.streams;
-
-import org.apache.commons.numbers.complex.Complex;
-
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
-
-/**
- * Tests for {@link ComplexUtils}.
- */
-class ComplexUtilsTest {
-
-    private static final double inf = Double.POSITIVE_INFINITY;
-    private static final double negInf = Double.NEGATIVE_INFINITY;
-    private static final double nan = Double.NaN;
-    private static final double pi = Math.PI;
-
-    private static final Complex negInfInf = Complex.ofCartesian(negInf, inf);
-    private static final Complex infNegInf = Complex.ofCartesian(inf, negInf);
-    private static final Complex infInf = Complex.ofCartesian(inf, inf);
-    private static final Complex negInfNegInf = Complex.ofCartesian(negInf, negInf);
-    private static final Complex infNaN = Complex.ofCartesian(inf, nan);
-    private static final Complex NAN = Complex.ofCartesian(nan, nan);
-
-    private static Complex[] c; // complex array with real values even and imag
-    // values odd
-    private static Complex[] cr; // complex array with real values consecutive
-    private static Complex[] ci; // complex array with imag values consecutive
-    private static double[] d; // real array with consecutive vals
-    private static double[] di; // interleaved real array with consecutive vals,
-    // 'interleaved' length
-    private static float[] f; // real array with consecutive vals
-    private static float[] fi; // interleaved real array with consecutive vals, interleaved
-    // length
-    private static double[] sr; // real component of split array, evens
-    private static double[] si; // imag component of split array, odds
-    private static float[] sfr; // real component of split array, float, evens
-    private static float[] sfi; // imag component of split array, float, odds
-    private static String msg; // error message for AssertEquals
-    // CHECKSTYLE: stop MultipleVariableDeclarations
-    private static Complex[][] c2d, cr2d, ci2d; // for 2d methods
-    private static Complex[][][] c3d, cr3d, ci3d; // for 3d methods
-    private static Complex[][][][] c4d, cr4d, ci4d; // for 3d methods
-    private static double[][] di2d0, di2d1, sr2d, si2d;
-    private static double[][][] di3d0, di3d1, di3d2, sr3d, si3d;
-    private static double[][][][] di4d0, di4d1, di4d2, di4d3, sr4d, si4d;
-    private static float[][] fi2d0, fi2d1, sfr2d, sfi2d;
-    private static float[][][] fi3d0, fi3d1, fi3d2, sfr3d, sfi3d;
-    private static float[][][][] sfr4d, sfi4d;
-    // CHECKSTYLE: resume MultipleVariableDeclarations
-
-    // CHECKSTYLE: stop MethodLength
-    private static void setArrays() { // initial setup method
-        c = new Complex[10];
-        cr = new Complex[10];
-        ci = new Complex[10];
-        d = new double[10];
-        f = new float[10];
-        di = new double[20];
-        fi = new float[20];
-        sr = new double[10];
-        si = new double[10];
-        sfr = new float[10];
-        sfi = new float[10];
-        c2d = new Complex[10][10];
-        cr2d = new Complex[10][10];
-        ci2d = new Complex[10][10];
-        c3d = new Complex[10][10][10];
-        cr3d = new Complex[10][10][10];
-        ci3d = new Complex[10][10][10];
-        c4d = new Complex[10][10][10][10];
-        cr4d = new Complex[10][10][10][10];
-        ci4d = new Complex[10][10][10][10];
-        sr2d = new double[10][10];
-        sr3d = new double[10][10][10];
-        sr4d = new double[10][10][10][10];
-        si2d = new double[10][10];
-        si3d = new double[10][10][10];
-        si4d = new double[10][10][10][10];
-        sfr2d = new float[10][10];
-        sfr3d = new float[10][10][10];
-        sfr4d = new float[10][10][10][10];
-        sfi2d = new float[10][10];
-        sfi3d = new float[10][10][10];
-        sfi4d = new float[10][10][10][10];
-        di2d0 = new double[20][10];
-        di2d1 = new double[10][20];
-        di3d0 = new double[20][10][10];
-        di3d1 = new double[10][20][10];
-        di3d2 = new double[10][10][20];
-        di4d0 = new double[20][10][10][10];
-        di4d1 = new double[10][20][10][10];
-        di4d2 = new double[10][10][20][10];
-        di4d3 = new double[10][10][10][20];
-        fi2d0 = new float[20][10];
-        fi2d1 = new float[10][20];
-        fi3d0 = new float[20][10][10];
-        fi3d1 = new float[10][20][10];
-        fi3d2 = new float[10][10][20];
-        for (int i = 0; i < 20; i += 2) {
-            int halfI = i / 2;
-
-            // Complex arrays
-            c[halfI] = Complex.ofCartesian(i, i + 1);
-            cr[halfI] = Complex.ofCartesian(halfI, 0);
-            ci[halfI] = Complex.ofCartesian(0, halfI);
-
-            // standalone - split equivalent to c
-            sr[halfI] = i;
-            si[halfI] = i + 1;
-            sfr[halfI] = i;
-            sfi[halfI] = i + 1;
-
-            // depending on method used equivalents to cr or ci
-            d[halfI] = halfI;
-            f[halfI] = halfI;
-
-            // interleaved - all equivalent to c2d
-            di[i] = i;
-            di[i + 1] = i + 1;
-            fi[i] = i;
-            fi[i + 1] = i + 1;
-        }
-        for (int i = 0; i < 10; i++) {
-            for (int j = 0; j < 20; j += 2) {
-                int halfJ = j / 2;
-                int real = 10 * i + j;
-                int imaginary = 10 * i + j + 1;
-
-                // Complex arrays
-                c2d[i][halfJ] = Complex.ofCartesian(real, imaginary);
-                cr2d[i][halfJ] = Complex.ofCartesian(real, 0);
-                ci2d[i][halfJ] = Complex.ofCartesian(0, imaginary);
-
-                // standalone - split equivalent to c2d, standalone equivalent to cr2d or ci2d
-                sr2d[i][halfJ] = real;
-                si2d[i][halfJ] = imaginary;
-                sfr2d[i][halfJ] = real;
-                sfi2d[i][halfJ] = imaginary;
-
-                // interleaved - all equivalent to c2d
-                di2d0[j][i] = 10 * halfJ + 2 * i;
-                di2d0[j + 1][i] = di2d0[j][i] + 1;
-                di2d1[i][j] = real;
-                di2d1[i][j + 1] = imaginary;
-                fi2d0[j][i] = 10 * halfJ + 2 * i;
-                fi2d0[j + 1][i] = fi2d0[j][i] + 1;
-                fi2d1[i][j] = real;
-                fi2d1[i][j + 1] = imaginary;
-            }
-        }
-        for (int i = 0; i < 10; i++) {
-            for (int j = 0; j < 10; j++) {
-                for (int k = 0; k < 20; k += 2) {
-                    int halfK = k / 2;
-                    int real = 100 * i + 10 * j + k;
-                    int imaginary = 100 * i + 10 * j + k + 1;
-
-                    // Complex arrays
-                    c3d[i][j][halfK] = Complex.ofCartesian(real, imaginary);
-                    cr3d[i][j][halfK] = Complex.ofCartesian(real, 0);
-                    ci3d[i][j][halfK] = Complex.ofCartesian(0, imaginary);
-
-                    // standalone - split equivalent to c3d, standalone equivalent to cr3d or ci3d
-                    sr3d[i][j][halfK] = real;
-                    si3d[i][j][halfK] = imaginary;
-                    sfr3d[i][j][halfK] = real;
-                    sfi3d[i][j][halfK] = imaginary;
-
-                    // interleaved - all equivalent to c3d
-                    di3d0[k][i][j] = 100 * halfK + 10 * i + 2 * j;
-                    di3d0[k + 1][i][j] = di3d0[k][i][j] + 1;
-                    di3d1[j][k][i] = 100 * j + 10 * halfK + 2 * i;
-                    di3d1[j][k + 1][i] = di3d1[j][k][i] + 1;
-                    di3d2[i][j][k] = real;
-                    di3d2[i][j][k + 1] = imaginary;
-                    fi3d0[k][i][j] = 100 * halfK + 10 * i + 2 * j;
-                    fi3d0[k + 1][i][j] = fi3d0[k][i][j] + 1;
-                    fi3d1[j][k][i] = 100 * j + 10 * halfK + 2 * i;
-                    fi3d1[j][k + 1][i] = fi3d1[j][k][i] + 1;
-                    fi3d2[i][j][k] = real;
-                    fi3d2[i][j][k + 1] = imaginary;
-                }
-            }
-        }
-        for (int i = 0; i < 10; i++) {
-            for (int j = 0; j < 10; j++) {
-                for (int k = 0; k < 10; k++) {
-                    for (int l = 0; l < 20; l += 2) {
-                        int halfL = l / 2;
-                        int real = 1000 * i + 100 * j + 10 * k + l;
-                        int imaginary = 1000 * i + 100 * j + 10 * k + l + 1;
-
-                        // Complex arrays
-                        c4d[i][j][k][halfL] = Complex.ofCartesian(real, imaginary);
-                        cr4d[i][j][k][halfL] = Complex.ofCartesian(real, 0);
-                        ci4d[i][j][k][halfL] = Complex.ofCartesian(0, imaginary);
-
-                        // standalone - split equivalent to c4d, standalone equivalent to cr4d or ci4d
-                        sr4d[i][j][k][halfL] = real;
-                        si4d[i][j][k][halfL] = imaginary;
-                        sfr4d[i][j][k][halfL] = real;
-                        sfi4d[i][j][k][halfL] = imaginary;
-
-                        // interleaved - all equivalent to c4d
-                        di4d0[l][i][j][k] = 1000 * halfL + 100 * i + 10 * j + 2 * k;
-                        di4d0[l + 1][i][j][k] = di4d0[l][i][j][k] + 1;
-                        di4d1[k][l][i][j] = 1000 * k + 100 * halfL + 10 * i + 2 * j;
-                        di4d1[k][l + 1][i][j] = di4d1[k][l][i][j] + 1;
-                        di4d2[j][k][l][i] = 1000 * j + 100 * k + 10 * halfL + 2 * i;
-                        di4d2[j][k][l + 1][i] = di4d2[j][k][l][i] + 1;
-                        di4d3[i][j][k][l] = real;
-                        di4d3[i][j][k][l + 1] = imaginary;
-                    }
-                }
-            }
-        }
-        msg = "";
-    }
-    // CHECKSTYLE: resume MethodLength
-
-    @Test
-    void testPolar2Complex() {
-        TestUtils.assertEquals(Complex.ONE, ComplexUtils.polar2Complex(1, 0), 10e-12);
-        TestUtils.assertEquals(Complex.ZERO, ComplexUtils.polar2Complex(0, 1), 10e-12);
-        TestUtils.assertEquals(Complex.ZERO, ComplexUtils.polar2Complex(0, -1), 10e-12);
-        TestUtils.assertEquals(Complex.I, ComplexUtils.polar2Complex(1, pi / 2), 10e-12);
-        TestUtils.assertEquals(Complex.I.negate(), ComplexUtils.polar2Complex(1, -pi / 2), 10e-12);
-        double r = 0;
-        for (int i = 0; i < 5; i++) {
-            r += i;
-            double theta = 0;
-            for (int j = 0; j < 20; j++) {
-                theta += pi / 6;
-                TestUtils.assertEquals(altPolar(r, theta), ComplexUtils.polar2Complex(r, theta), 10e-12);
-            }
-            theta = -2 * pi;
-            for (int j = 0; j < 20; j++) {
-                theta -= pi / 6;
-                TestUtils.assertEquals(altPolar(r, theta), ComplexUtils.polar2Complex(r, theta), 10e-12);
-            }
-        }
-        // 1D
-        double[] r1D = new double[11];
-        double[] theta1D = new double[11];
-        for (int i = 0; i < 11; i++) {
-            r1D[i] = i;
-        }
-        theta1D[5] = 0;
-        for (int i = 1; i < 5; i++) {
-            theta1D[5 + i] = theta1D[5 + i - 1] + pi / 6;
-            theta1D[5 - i] = theta1D[5 + i + 1] - pi / 6;
-        }
-        Complex[] observed1D = ComplexUtils.polar2Complex(r1D, theta1D);
-        Assertions.assertEquals(r1D.length, observed1D.length);
-        for (int i = 0; i < r1D.length; i++) {
-            Assertions.assertEquals(ComplexUtils.polar2Complex(r1D[i], theta1D[i]), observed1D[i]);
-        }
-
-        // 2D
-        double[][] theta2D = new double[3][4];
-        double[][] r2D = new double[3][4];
-        for (int i = 0; i < 3; i++) {
-            for (int j = 0; j < 4; j++) {
-                r2D[i][j] = i + j;
-                theta2D[i][j] = i * j;
-            }
-        }
-        Complex[][] observed2D = ComplexUtils.polar2Complex(r2D, theta2D);
-        Assertions.assertEquals(r2D.length, observed2D.length);
-        for (int i = 0; i < r2D.length; i++) {
-            TestUtils.assertSame(msg, ComplexUtils.polar2Complex(r2D[i], theta2D[i]), observed2D[i]);
-        }
-
-        // 3D
-        double[][][] theta3D = new double[3][4][3];
-        double[][][] r3D = new double[3][4][3];
-        for (int i = 0; i < 3; i++) {
-            for (int j = 0; j < 4; j++) {
-                for (int k = 0; k < 3; k++) {
-                    r3D[i][j][k] = i + j + k;
-                    theta3D[i][j][k] = i * j * k;
-                }
-            }
-        }
-        Complex[][][] observed3D = ComplexUtils.polar2Complex(r3D, theta3D);
-        Assertions.assertEquals(r3D.length, observed3D.length);
-        for (int i = 0; i < r3D.length; i++) {
-            TestUtils.assertSame(msg, ComplexUtils.polar2Complex(r3D[i], theta3D[i]), observed3D[i]);
-        }
-    }
-
-    private Complex altPolar(double r, double theta) {
-        return Complex.I.multiply(Complex.ofCartesian(theta, 0)).exp().multiply(Complex.ofCartesian(r, 0));
-    }
-
-    @Test
-    void testPolar2ComplexIllegalModulus() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.polar2Complex(-1, 0)
-        );
-    }
-
-    @Test
-    void testPolar2ComplexIllegalModulus1D() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.polar2Complex(new double[]{0, -1, 2}, new double[]{0, 1, 2})
-        );
-    }
-
-    @Test
-    void testPolar2ComplexIllegalModulus2D() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.polar2Complex(new double[][]{{0, 2, 2}, {0, -1, 2}}, new double[][]{{0, 1, 2}, {0, 1, 2}})
-        );
-    }
-
-    @Test
-    void testPolar2ComplexIllegalModulus3D() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.polar2Complex(new double[][][]{{{0, 2, 2}}, {{0, -1, 2}}}, new double[][][]{{{0, 1, 2}}, {{0, 1, 2}}})
-        );
-    }
-
-    @Test
-    void testPolar2ComplexNaN() {
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(nan, 1));
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(1, nan));
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(nan, nan));
-    }
-
-    @Test
-    void testPolar2ComplexInf() {
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(1, inf));
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(1, negInf));
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(inf, inf));
-        TestUtils.assertSame(NAN, ComplexUtils.polar2Complex(inf, negInf));
-        TestUtils.assertSame(infInf, ComplexUtils.polar2Complex(inf, pi / 4));
-        TestUtils.assertSame(infNaN, ComplexUtils.polar2Complex(inf, 0));
-        TestUtils.assertSame(infNegInf, ComplexUtils.polar2Complex(inf, -pi / 4));
-        TestUtils.assertSame(negInfInf, ComplexUtils.polar2Complex(inf, 3 * pi / 4));
-        TestUtils.assertSame(negInfNegInf, ComplexUtils.polar2Complex(inf, 5 * pi / 4));
-    }
-
-    @Test
-    void testCExtract() {
-        final double[] real = new double[] {negInf, -123.45, 0, 1, 234.56, pi, inf};
-        final Complex[] complex = ComplexUtils.real2Complex(real);
-
-        for (int i = 0; i < real.length; i++) {
-            Assertions.assertEquals(real[i], complex[i].getReal());
-        }
-    }
-
-    // EXTRACTION METHODS
-
-    @Test
-    void testExtractionMethods() {
-        setArrays();
-        // Extract complex from real double array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(3, 0), ComplexUtils.extractComplexFromRealArray(d, 3));
-        // Extract complex from real float array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(3, 0), ComplexUtils.extractComplexFromRealArray(f, 3));
-        // Extract complex from real double array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(0, 3), ComplexUtils.extractComplexFromImaginaryArray(d, 3));
-        // Extract complex from real float array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(0, 3), ComplexUtils.extractComplexFromImaginaryArray(f, 3));
-        // Extract real double from complex array, index 3
-        Assertions.assertEquals(6, ComplexUtils.extractRealFromComplexArray(c, 3));
-        // Extract real float from complex array, index 3
-        Assertions.assertEquals(6, ComplexUtils.extractRealFloatFromComplexArray(c, 3));
-        // Extract real double from complex array, index 3
-        Assertions.assertEquals(7, ComplexUtils.extractImaginaryFromComplexArray(c, 3));
-        // Extract real float from complex array, index 3
-        Assertions.assertEquals(7, ComplexUtils.extractImaginaryFloatFromComplexArray(c, 3));
-        // Extract complex from interleaved double array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(6, 7), ComplexUtils.extractComplexFromInterleavedArray(d, 3));
-        // Extract interleaved double array from complex array, index 3
-        Assertions.assertArrayEquals(new double[]{6d, 7d}, ComplexUtils.extractInterleavedFromComplexArray(c, 3));
-        // Extract interleaved float array from complex array, index 3
-        Assertions.assertArrayEquals(new float[]{6f, 7f}, ComplexUtils.extractInterleavedFloatFromComplexArray(c, 3));
-        // Extract complex from interleaved float array, index 3
-        TestUtils.assertSame(Complex.ofCartesian(6, 7), ComplexUtils.extractComplexFromInterleavedArray(f, 3));
-        // Extract interleaved double from complex array, index 3
-        Assertions.assertArrayEquals(new double[] {6, 7}, ComplexUtils.extractInterleavedFromComplexArray(c, 3),
-                Math.ulp(1), msg);
-        // Extract interleaved float from complex array, index 3
-        Assertions.assertArrayEquals(new double[] {6, 7}, ComplexUtils.extractInterleavedFromComplexArray(c, 3),
-                Math.ulp(1), msg);
-    }
-    // REAL <-> COMPLEX
-
-    @Test
-    void testRealToComplex() {
-        setArrays();
-        // Real double to complex, whole array
-        TestUtils.assertEquals(msg, cr, ComplexUtils.real2Complex(d), Math.ulp(1.0));
-        // Real float to complex, whole array
-        TestUtils.assertEquals(msg, cr, ComplexUtils.real2Complex(f), Math.ulp(1.0));
-
-        // 2d
-        TestUtils.assertEquals(msg, cr2d, ComplexUtils.real2Complex(sr2d), 0);
-        TestUtils.assertEquals(msg, cr2d, ComplexUtils.real2Complex(sfr2d), 0);
-
-        // 3d
-        TestUtils.assertEquals(msg, cr3d, ComplexUtils.real2Complex(sr3d), 0);
-        TestUtils.assertEquals(msg, cr3d, ComplexUtils.real2Complex(sfr3d), 0);
-
-        // 4d
-        TestUtils.assertEquals(msg, cr4d, ComplexUtils.real2Complex(sr4d), 0);
-    }
-
-    @Test
-    void testComplexToReal() {
-        setArrays();
-        // Real complex to double, whole array
-        Assertions.assertArrayEquals(sr, ComplexUtils.complex2Real(c), Math.ulp(1.0), msg);
-        // Real complex to float, whole array
-        Assertions.assertArrayEquals(sfr, ComplexUtils.complex2RealFloat(c), Math.ulp(1.0f), msg);
-
-        // 2d
-        TestUtils.assertEquals(msg, sr2d, ComplexUtils.complex2Real(cr2d), 0);
-        TestUtils.assertEquals(msg, sfr2d, ComplexUtils.complex2RealFloat(cr2d), 0);
-
-        // 3d
-        TestUtils.assertEquals(msg, sr3d, ComplexUtils.complex2Real(cr3d), 0);
-        TestUtils.assertEquals(msg, sfr3d, ComplexUtils.complex2RealFloat(cr3d), 0);
-
-        // 4d
-        TestUtils.assertEquals(msg, sr4d, ComplexUtils.complex2Real(cr4d), 0);
-        TestUtils.assertEquals(msg, sfr4d, ComplexUtils.complex2RealFloat(cr4d), 0);
-    }
-
-    // IMAGINARY <-> COMPLEX
-
-    @Test
-    void testImaginaryToComplex() {
-        setArrays();
-        // Imaginary double to complex, whole array
-        TestUtils.assertEquals(msg, ci, ComplexUtils.imaginary2Complex(d), Math.ulp(1.0));
-        // Imaginary float to complex, whole array
-        TestUtils.assertEquals(msg, ci, ComplexUtils.imaginary2Complex(f), Math.ulp(1.0));
-
-        // 2d
-        TestUtils.assertEquals(msg, ci2d, ComplexUtils.imaginary2Complex(si2d), 0);
-
-        // 3d
-        TestUtils.assertEquals(msg, ci3d, ComplexUtils.imaginary2Complex(si3d), 0);
-
-        // 4d
-        TestUtils.assertEquals(msg, ci4d, ComplexUtils.imaginary2Complex(si4d), 0);
-    }
-
-    @Test
-    void testComplexToImaginary() {
-        setArrays();
-        // Imaginary complex to double, whole array
-        Assertions.assertArrayEquals(si, ComplexUtils.complex2Imaginary(c), Math.ulp(1.0), msg);
-        // Imaginary complex to float, whole array
-        Assertions.assertArrayEquals(sfi, ComplexUtils.complex2ImaginaryFloat(c), Math.ulp(1.0f), msg);
-
-        // 2d
-        TestUtils.assertEquals(msg, si2d, ComplexUtils.complex2Imaginary(ci2d), 0);
-        TestUtils.assertEquals(msg, sfi2d, ComplexUtils.complex2ImaginaryFloat(ci2d), 0);
-
-        // 3d
-        TestUtils.assertEquals(msg, si3d, ComplexUtils.complex2Imaginary(ci3d), 0);
-        TestUtils.assertEquals(msg, sfi3d, ComplexUtils.complex2ImaginaryFloat(ci3d), 0);
-
-        // 4d
-        TestUtils.assertEquals(msg, si4d, ComplexUtils.complex2Imaginary(ci4d), 0);
-        TestUtils.assertEquals(msg, sfi4d, ComplexUtils.complex2ImaginaryFloat(ci4d), 0);
-    }
-
-    // INTERLEAVED <-> COMPLEX
-
-    @Test
-    void testComplex2InterleavedIllegalIndex2Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c2d, -1)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedIllegalIndex2Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c2d, 2)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedIllegalIndex3Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c3d, -1)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedIllegalIndex3Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c3d, 3)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedIllegalIndex4Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c4d, -1)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedIllegalIndex4Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2Interleaved(c4d, 4)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedFloatIllegalIndex2Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2InterleavedFloat(c2d, -1)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedFloatIllegalIndex2Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2InterleavedFloat(c2d, 2)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedFloatIllegalIndex3Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2InterleavedFloat(c3d, -1)
-        );
-    }
-
-    @Test
-    void testComplex2InterleavedFloatIllegalIndex3Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.complex2InterleavedFloat(c3d, 3)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex2Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di2d0, -1)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex2Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di2d0, 2)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex3Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di3d0, -1)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex3Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di3d0, 3)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex4Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di4d0, -1)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexIllegalIndex4Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(di4d0, 4)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexFloatIllegalIndex2Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(fi2d0, -1)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexFloatIllegalIndex2Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(fi2d0, 2)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexFloatIllegalIndex3Dmin() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(fi3d0, -1)
-        );
-    }
-
-    @Test
-    void testInterleaved2ComplexFloatIllegalIndex3Dmax() {
-        Assertions.assertThrows(IllegalArgumentException.class,
-            () -> ComplexUtils.interleaved2Complex(fi3d0, 3)
-        );
-    }
-
-    @Test
-    void testInterleavedToComplex() {
-        setArrays();
-        // Interleaved double to complex, whole array
-        TestUtils.assertEquals(msg, c, ComplexUtils.interleaved2Complex(di), Math.ulp(1.0));
-        // Interleaved float to complex, whole array
-        TestUtils.assertEquals(msg, c, ComplexUtils.interleaved2Complex(fi), Math.ulp(1.0));
-
-        // 2d
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(di2d0, 0));
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(di2d1, 1));
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(di2d1));
-
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(fi2d0, 0));
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(fi2d1, 1));
-        TestUtils.assertSame(msg, c2d, ComplexUtils.interleaved2Complex(fi2d1));
-
-        // 3d
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(di3d0, 0));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(di3d1, 1));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(di3d2, 2));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(di3d2));
-
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(fi3d0, 0));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(fi3d1, 1));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(fi3d2, 2));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.interleaved2Complex(fi3d2));
-
-        // 4d
-        TestUtils.assertSame(msg, c4d, ComplexUtils.interleaved2Complex(di4d0, 0));
-        TestUtils.assertSame(msg, c4d, ComplexUtils.interleaved2Complex(di4d1, 1));
-        TestUtils.assertSame(msg, c4d, ComplexUtils.interleaved2Complex(di4d2, 2));
-        TestUtils.assertSame(msg, c4d, ComplexUtils.interleaved2Complex(di4d3, 3));
-    }
-
-    @Test
-    void testComplexToInterleaved() {
-        setArrays();
-        Assertions.assertArrayEquals(di, ComplexUtils.complex2Interleaved(c), Math.ulp(1.0), msg);
-        // Interleaved complex to float, whole array
-        Assertions.assertArrayEquals(fi, ComplexUtils.complex2InterleavedFloat(c), Math.ulp(1.0f), msg);
-
-        // 2d
-        TestUtils.assertEquals(msg, di2d0, ComplexUtils.complex2Interleaved(c2d, 0), 0);
-        TestUtils.assertEquals(msg, di2d1, ComplexUtils.complex2Interleaved(c2d, 1), 0);
-        TestUtils.assertEquals(msg, di2d1, ComplexUtils.complex2Interleaved(c2d), 0);
-
-        TestUtils.assertEquals(msg, fi2d0, ComplexUtils.complex2InterleavedFloat(c2d, 0), 0);
-        TestUtils.assertEquals(msg, fi2d1, ComplexUtils.complex2InterleavedFloat(c2d, 1), 0);
-        TestUtils.assertEquals(msg, fi2d1, ComplexUtils.complex2InterleavedFloat(c2d), 0);
-
-        // 3d
-        TestUtils.assertEquals(msg, di3d0, ComplexUtils.complex2Interleaved(c3d, 0), 0);
-        TestUtils.assertEquals(msg, di3d1, ComplexUtils.complex2Interleaved(c3d, 1), 0);
-        TestUtils.assertEquals(msg, di3d2, ComplexUtils.complex2Interleaved(c3d, 2), 0);
-        TestUtils.assertEquals(msg, di3d2, ComplexUtils.complex2Interleaved(c3d), 0);
-
-        TestUtils.assertEquals(msg, fi3d0, ComplexUtils.complex2InterleavedFloat(c3d, 0), 0);
-        TestUtils.assertEquals(msg, fi3d1, ComplexUtils.complex2InterleavedFloat(c3d, 1), 0);
-        TestUtils.assertEquals(msg, fi3d2, ComplexUtils.complex2InterleavedFloat(c3d, 2), 0);
-        TestUtils.assertEquals(msg, fi3d2, ComplexUtils.complex2InterleavedFloat(c3d), 0);
-
-        // 4d
-        TestUtils.assertEquals(msg, di4d0, ComplexUtils.complex2Interleaved(c4d, 0), 0);
-        TestUtils.assertEquals(msg, di4d1, ComplexUtils.complex2Interleaved(c4d, 1), 0);
-        TestUtils.assertEquals(msg, di4d2, ComplexUtils.complex2Interleaved(c4d, 2), 0);
-        TestUtils.assertEquals(msg, di4d3, ComplexUtils.complex2Interleaved(c4d, 3), 0);
-        TestUtils.assertEquals(msg, di4d3, ComplexUtils.complex2Interleaved(c4d), 0);
-    }
-
-    // SPLIT TO COMPLEX
-    @Test
-    void testSplit2Complex() {
-        setArrays();
-        // Split double to complex, whole array
-        TestUtils.assertEquals(msg, c, ComplexUtils.split2Complex(sr, si), Math.ulp(1.0));
-
-        TestUtils.assertSame(msg, c2d, ComplexUtils.split2Complex(sr2d, si2d));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.split2Complex(sr3d, si3d));
-        TestUtils.assertSame(msg, c4d, ComplexUtils.split2Complex(sr4d, si4d));
-        TestUtils.assertSame(msg, c2d, ComplexUtils.split2Complex(sfr2d, sfi2d));
-        TestUtils.assertSame(msg, c3d, ComplexUtils.split2Complex(sfr3d, sfi3d));
-    }
-
-    // INITIALIZATION METHODS
-
-    @Test
-    void testInitialize() {
-        Complex[] complexes = new Complex[10];
-        ComplexUtils.initialize(complexes);
-        for (Complex cc : complexes) {
-            TestUtils.assertEquals(Complex.ofCartesian(0, 0), cc, Math.ulp(0));
-        }
-    }
-
-    @Test
-    void testInitialize2d() {
-        Complex[][] complexes = new Complex[10][10];
-        ComplexUtils.initialize(complexes);
-        for (Complex[] c1 : complexes) {
-            for (Complex c0 : c1) {
-                TestUtils.assertEquals(Complex.ofCartesian(0, 0), c0, Math.ulp(0));
-            }
-        }
-    }
-
-    @Test
-    void testInitialize3d() {
-        Complex[][][] complexes = new Complex[10][10][10];
-        ComplexUtils.initialize(complexes);
-        for (Complex[][] c2 : complexes) {
-            for (Complex[] c1 : c2) {
-                for (Complex c0 : c1) {
-                    TestUtils.assertEquals(Complex.ofCartesian(0, 0), c0, Math.ulp(0));
-                }
-            }
-        }
-    }
-
-    @Test
-    void testAbs() {
-        setArrays();
-        double[] observed = ComplexUtils.abs(c);
-        Assertions.assertEquals(c.length, observed.length);
-        for (int i = 0; i < c.length; i++) {
-            Assertions.assertEquals(c[i].abs(), observed[i]);
-        }
-    }
-
-    @Test
-    void testArg() {
-        setArrays();
-        double[] observed = ComplexUtils.arg(c);
-        Assertions.assertEquals(c.length, observed.length);
-        for (int i = 0; i < c.length; i++) {
-            Assertions.assertEquals(c[i].arg(), observed[i]);
-        }
-    }
-}
diff --git a/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/TestUtils.java b/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/TestUtils.java
deleted file mode 100644
index 0b3ff66..0000000
--- a/commons-numbers-complex-streams/src/test/java/org/apache/commons/numbers/complex/streams/TestUtils.java
+++ /dev/null
@@ -1,210 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.numbers.complex.streams;
-
-import org.apache.commons.numbers.complex.Complex;
-import org.apache.commons.numbers.core.Precision;
-
-import org.junit.jupiter.api.Assertions;
-
-/**
- * Test utilities.
- */
-@SuppressWarnings("WeakerAccess")
-final class TestUtils {
-    /**
-     * Collection of static methods used in math unit tests.
-     */
-    private TestUtils() {
-        super();
-    }
-
-    /**
-     * Verifies that the two arguments are exactly the same, either
-     * both NaN or infinities of same sign, or identical floating point values.
-     */
-    public static void assertSame(String msg, Complex[] expected, Complex[] actual) {
-        assertEquals(msg, expected, actual, 0);
-    }
-
-    /**
-     * Verifies that the two arguments are exactly the same, either
-     * both NaN or infinities of same sign, or identical floating point values.
-     */
-    public static void assertSame(String msg, Complex[][] expected, Complex[][] actual) {
-        assertEquals(msg, expected, actual, 0);
-    }
-
-    /**
-     * Verifies that the two arguments are exactly the same, either
-     * both NaN or infinities of same sign, or identical floating point values.
-     */
-    public static void assertSame(String msg, Complex[][][] expected, Complex[][][] actual) {
-        assertEquals(msg, expected, actual, 0);
-    }
-
-    /**
-     * Verifies that the two arguments are exactly the same, either
-     * both NaN or infinities of same sign, or identical floating point values.
-     */
-    public static void assertSame(String msg, Complex[][][][] expected, Complex[][][][] actual) {
-        assertEquals(msg, expected, actual, 0);
-    }
-
-    /**
-     * Verifies that real and imaginary parts of the two complex arguments
-     * are exactly the same.  Also ensures that NaN / infinite components match.
-     */
-    public static void assertSame(Complex expected, Complex actual) {
-        Assertions.assertEquals(expected.getReal(), actual.getReal());
-        Assertions.assertEquals(expected.getImaginary(), actual.getImaginary());
-    }
-
-    /**
-     * Verifies that real and imaginary parts of the two complex arguments
-     * differ by at most delta.  Also ensures that NaN / infinite components match.
-     */
-    public static void assertEquals(Complex expected, Complex actual, double delta) {
-        Assertions.assertEquals(expected.getReal(), actual.getReal(), delta, "Real Values Differ");
-        Assertions.assertEquals(expected.getImaginary(), actual.getImaginary(), delta, "Imaginary Values Differ");
-    }
-
-    /** verifies that two 2D arrays are close (sup norm) */
-    public static void assertEquals(String msg, double[][] expected, double[][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            Assertions.assertArrayEquals(expected[i], observed[i], tolerance, msg + "[" + i + "]");
-        }
-    }
-
-    /** verifies that two 3D arrays are close (sup norm) */
-    public static void assertEquals(String msg, double[][][] expected, double[][][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two 4D arrays are close (sup norm) */
-    public static void assertEquals(String msg, double[][][][] expected, double[][][][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two 4D arrays are close (sup norm) */
-    public static void assertEquals(String msg, float[][][][] expected, float[][][][] observed, float tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two 2D arrays are close (sup norm) */
-    public static void assertEquals(String msg, float[][] expected, float[][] observed, float tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            Assertions.assertArrayEquals(expected[i], observed[i], tolerance, msg + "[" + i + "]");
-        }
-    }
-
-    /** verifies that two 3D arrays are close (sup norm) */
-    public static void assertEquals(String msg, float[][][] expected, float[][][] observed, float tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two arrays are close (sup norm) */
-    public static void assertEquals(String msg, Complex[] expected, Complex[] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        StringBuilder out = new StringBuilder(msg);
-        boolean failure = false;
-        for (int i = 0; i < expected.length; i++) {
-            if (!Precision.equalsIncludingNaN(expected[i].getReal(), observed[i].getReal(), tolerance)) {
-                failure = true;
-                out.append("\n[").append(i).append("] ");
-                out.append("Real elements differ. ");
-                out.append(" expected = ");
-                out.append(expected[i].getReal());
-                out.append(" observed = ");
-                out.append(observed[i].getReal());
-            }
-            if (!Precision.equalsIncludingNaN(expected[i].getImaginary(), observed[i].getImaginary(), tolerance)) {
-                failure = true;
-                out.append("\n[").append(i).append("] ");
-                out.append("Imaginary elements differ. ");
-                out.append(" expected = ");
-                out.append(expected[i].getImaginary());
-                out.append(" observed = ");
-                out.append(observed[i].getImaginary());
-            }
-        }
-        if (failure) {
-            Assertions.fail(out.toString());
-        }
-    }
-
-    /** verifies that two 2D arrays are close (sup norm) */
-    public static void assertEquals(String msg, Complex[][] expected, Complex[][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two 3D arrays are close (sup norm) */
-    public static void assertEquals(String msg, Complex[][][] expected, Complex[][][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /** verifies that two 4D arrays are close (sup norm) */
-    public static void assertEquals(String msg, Complex[][][][] expected, Complex[][][][] observed, double tolerance) {
-        assertArrayLengthsEqual(msg, expected.length, observed.length);
-        for (int i = 0; i < expected.length; i++) {
-            assertEquals(msg + "[" + i + "]", expected[i], observed[i], tolerance);
-        }
-    }
-
-    /**
-     * Assert that the given array lengths are the same
-     * @param msg Initial message
-     * @param expectedLength expected array length
-     * @param observedLength observed array length
-     */
-    private static void assertArrayLengthsEqual(String msg, int expectedLength, int observedLength) {
-        if (expectedLength != observedLength) {
-            StringBuilder out = new StringBuilder(msg);
-            if (msg != null && msg.length() > 0) {
-                out.append("\n");
-            }
-            out.append("Arrays not same length. \n");
-            out.append("expected has length ").append(expectedLength);
-            out.append(" observed has length = ").append(observedLength);
-            Assertions.fail(out.toString());
-        }
-
-    }
-}
-
-