| /* |
| * 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.math4.transform; |
| |
| import org.apache.commons.math4.analysis.UnivariateFunction; |
| import org.apache.commons.math4.exception.MathIllegalArgumentException; |
| import org.apache.commons.math4.exception.NonMonotonicSequenceException; |
| import org.apache.commons.math4.exception.NotStrictlyPositiveException; |
| |
| /** |
| * Interface for one-dimensional data sets transformations producing real results. |
| * <p> |
| * Such transforms include {@link FastSineTransformer sine transform}, |
| * {@link FastCosineTransformer cosine transform} or {@link |
| * FastHadamardTransformer Hadamard transform}. |
| * |
| * @since 2.0 |
| */ |
| public interface RealTransformer { |
| |
| /** |
| * Returns the (forward, inverse) transform of the specified real data set. |
| * |
| * @param f the real data array to be transformed (signal) |
| * @param type the type of transform (forward, inverse) to be performed |
| * @return the real transformed array (spectrum) |
| * @throws MathIllegalArgumentException if the array cannot be transformed |
| * with the given type (this may be for example due to array size, which is |
| * constrained in some transforms) |
| */ |
| double[] transform(double[] f, TransformType type) throws MathIllegalArgumentException; |
| |
| /** |
| * Returns the (forward, inverse) transform of the specified real function, |
| * sampled on the specified interval. |
| * |
| * @param f the function to be sampled and transformed |
| * @param min the (inclusive) lower bound for the interval |
| * @param max the (exclusive) upper bound for the interval |
| * @param n the number of sample points |
| * @param type the type of transform (forward, inverse) to be performed |
| * @return the real transformed array |
| * @throws NonMonotonicSequenceException if the lower bound is greater than, or equal to the upper bound |
| * @throws NotStrictlyPositiveException if the number of sample points is negative |
| * @throws MathIllegalArgumentException if the sample cannot be transformed |
| * with the given type (this may be for example due to sample size, which is |
| * constrained in some transforms) |
| */ |
| double[] transform(UnivariateFunction f, double min, double max, int n, |
| TransformType type) |
| throws NonMonotonicSequenceException, NotStrictlyPositiveException, MathIllegalArgumentException; |
| |
| } |