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<div class="subTitle">org.apache.sysds.runtime.util</div>
<h2 title="Class DataConverter" class="title">Class DataConverter</h2>
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<pre>public class <span class="typeNameLabel">DataConverter</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">This class provides methods to read and write matrix blocks from to HDFS using different data formats.
Those functionalities are used especially for CP read/write and exporting in-memory matrices to HDFS
(before executing MR jobs).</div>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#DataConverter--">DataConverter</a></span>()</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>static org.apache.commons.math3.linear.Array2DRowRealMatrix</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToArray2DRowRealMatrix-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToArray2DRowRealMatrix</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>
<div class="block">Helper method that converts SystemDS matrix variable (<code>varname</code>) into a Array2DRowRealMatrix format,
which is useful in invoking Apache CommonsMath.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static org.apache.commons.math3.linear.BlockRealMatrix</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToBlockRealMatrix-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToBlockRealMatrix</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static boolean[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToBooleanVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToBooleanVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/data/DenseBlock.html" title="class in org.apache.sysds.runtime.data">DenseBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDenseBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToDenseBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/data/DenseBlock.html" title="class in org.apache.sysds.runtime.data">DenseBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDenseBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-boolean-">convertToDenseBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb,
boolean&nbsp;deep)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDoubleList-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToDoubleList</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static double[][]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDoubleMatrix-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToDoubleMatrix</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>
<div class="block">Creates a two-dimensional double matrix of the input matrix block.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDoubleVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToDoubleVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDoubleVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-boolean-">convertToDoubleVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb,
boolean&nbsp;deep)</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static double[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToDoubleVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-boolean-boolean-">convertToDoubleVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb,
boolean&nbsp;deep,
boolean&nbsp;allowNull)</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToFrameBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>
<div class="block">Converts a matrix block into a frame block of value type double.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-org.apache.sysds.common.Types.ValueType-">convertToFrameBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb,
<a href="../../../../../org/apache/sysds/common/Types.ValueType.html" title="enum in org.apache.sysds.common">Types.ValueType</a>&nbsp;vt)</code>
<div class="block">Converts a matrix block into a frame block of a given value type.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-org.apache.sysds.runtime.matrix.data.MatrixBlock-org.apache.sysds.common.Types.ValueType:A-">convertToFrameBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb,
<a href="../../../../../org/apache/sysds/common/Types.ValueType.html" title="enum in org.apache.sysds.common">Types.ValueType</a>[]&nbsp;schema)</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-java.lang.String:A:A-">convertToFrameBlock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[][]&nbsp;data)</code>
<div class="block">Converts a two dimensions string array into a frame block of
value type string.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-java.lang.String:A:A-org.apache.sysds.common.Types.ValueType:A-">convertToFrameBlock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[][]&nbsp;data,
<a href="../../../../../org/apache/sysds/common/Types.ValueType.html" title="enum in org.apache.sysds.common">Types.ValueType</a>[]&nbsp;schema)</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToFrameBlock-java.lang.String:A:A-org.apache.sysds.common.Types.ValueType:A-java.lang.String:A-">convertToFrameBlock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[][]&nbsp;data,
<a href="../../../../../org/apache/sysds/common/Types.ValueType.html" title="enum in org.apache.sysds.common">Types.ValueType</a>[]&nbsp;schema,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;colnames)</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>static int[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToIntVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToIntVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>static long[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToLongVector-org.apache.sysds.runtime.matrix.data.MatrixBlock-">convertToLongVector</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;mb)</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-org.apache.sysds.runtime.matrix.data.CTableMap-">convertToMatrixBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/CTableMap.html" title="class in org.apache.sysds.runtime.matrix.data">CTableMap</a>&nbsp;map)</code>&nbsp;</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-org.apache.sysds.runtime.matrix.data.CTableMap-int-int-">convertToMatrixBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/CTableMap.html" title="class in org.apache.sysds.runtime.matrix.data">CTableMap</a>&nbsp;map,
int&nbsp;rlen,
int&nbsp;clen)</code>
<div class="block">NOTE: this method also ensures the specified matrix dimensions</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-double:A:A-">convertToMatrixBlock</a></span>(double[][]&nbsp;data)</code>
<div class="block">Creates a dense Matrix Block and copies the given double matrix into it.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-double:A-boolean-">convertToMatrixBlock</a></span>(double[]&nbsp;data,
boolean&nbsp;columnVector)</code>
<div class="block">Creates a dense Matrix Block and copies the given double vector into it.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-org.apache.sysds.runtime.matrix.data.FrameBlock-">convertToMatrixBlock</a></span>(<a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a>&nbsp;frame)</code>
<div class="block">Converts a frame block with arbitrary schema into a matrix block.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-java.util.HashMap-">convertToMatrixBlock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a>&lt;<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixIndexes.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixIndexes</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>&gt;&nbsp;map)</code>&nbsp;</td>
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<tr id="i24" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/runtime/util/DataConverter.html#convertToMatrixBlock-java.util.HashMap-int-int-">convertToMatrixBlock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a>&lt;<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixIndexes.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixIndexes</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>&gt;&nbsp;map,
int&nbsp;rlen,
int&nbsp;clen)</code>
<div class="block">NOTE: this method also ensures the specified matrix dimensions</div>
</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a></code></td>
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<td class="colFirst"><code>static void</code></td>
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<a href="../../../../../org/apache/sysds/runtime/meta/DataCharacteristics.html" title="class in org.apache.sysds.runtime.meta">DataCharacteristics</a>&nbsp;dc,
int&nbsp;replication,
<a href="../../../../../org/apache/sysds/runtime/io/FileFormatProperties.html" title="class in org.apache.sysds.runtime.io">FileFormatProperties</a>&nbsp;formatProperties)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<a href="../../../../../org/apache/sysds/runtime/io/FileFormatProperties.html" title="class in org.apache.sysds.runtime.io">FileFormatProperties</a>&nbsp;formatProperties,
boolean&nbsp;diag)
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<div class="block">Core method for reading matrices in format textcell, matrixmarket, binarycell, or binaryblock
from HDFS into main memory. For expected dense matrices we directly copy value- or block-at-a-time
into the target matrix. In contrast, for sparse matrices, we append (column-value)-pairs and do a
final sort if required in order to prevent large reorg overheads and increased memory consumption
in case of unordered inputs.
DENSE MxN input:
* best/average/worst: O(M*N)
SPARSE MxN input
* best (ordered, or binary block w/ clen&lt;=blen): O(M*N)
* average (unordered): O(M*N*log(N))
* worst (descending order per row): O(M * N^2)
NOTE: providing an exact estimate of 'expected sparsity' can prevent a full copy of the result
matrix block (required for changing sparse-&gt;dense, or vice versa)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prop</code> - read properties</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
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<div class="block">Creates a two-dimensional double matrix of the input matrix block.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mb</code> - matrix block</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>2d double array</dd>
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<div class="block">Creates a dense Matrix Block and copies the given double matrix into it.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - 2d double array</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
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<div class="block">Converts an Integer matrix to an MatrixBlock</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - Int matrix input that is converted to double MatrixBlock</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The matrixBlock constructed.</dd>
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boolean&nbsp;columnVector)</pre>
<div class="block">Creates a dense Matrix Block and copies the given double vector into it.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - double array</dd>
<dd><code>columnVector</code> - if true, create matrix with single column. if false, create matrix with single row</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;convertToMatrixBlock(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html?is-external=true" title="class or interface in java.util">HashMap</a>&lt;<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixIndexes.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixIndexes</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="class or interface in java.lang">Double</a>&gt;&nbsp;map,
int&nbsp;rlen,
int&nbsp;clen)</pre>
<div class="block">NOTE: this method also ensures the specified matrix dimensions</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>map</code> - map of matrix index keys and double values</dd>
<dd><code>rlen</code> - number of rows</dd>
<dd><code>clen</code> - number of columns</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
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int&nbsp;rlen,
int&nbsp;clen)</pre>
<div class="block">NOTE: this method also ensures the specified matrix dimensions</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>map</code> - ?</dd>
<dd><code>rlen</code> - number of rows</dd>
<dd><code>clen</code> - number of columns</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/sysds/runtime/matrix/data/MatrixBlock.html" title="class in org.apache.sysds.runtime.matrix.data">MatrixBlock</a>&nbsp;convertToMatrixBlock(<a href="../../../../../org/apache/sysds/runtime/matrix/data/FrameBlock.html" title="class in org.apache.sysds.runtime.matrix.data">FrameBlock</a>&nbsp;frame)</pre>
<div class="block">Converts a frame block with arbitrary schema into a matrix block.
Since matrix block only supports value type double, we do a best
effort conversion of non-double types which might result in errors
for non-numerical data.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>frame</code> - frame block</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix block</dd>
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<div class="block">Converts a frame block with arbitrary schema into a two dimensional
string array.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>frame</code> - frame block</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>2d string array</dd>
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<div class="block">Converts a two dimensions string array into a frame block of
value type string. If the given array is null or of length 0,
we return an empty frame block.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - 2d string array</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>frame block</dd>
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<div class="block">Converts a matrix block into a frame block of value type double.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mb</code> - matrix block</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>frame block of type double</dd>
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<div class="block">Converts a matrix block into a frame block of a given value type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mb</code> - matrix block</dd>
<dd><code>vt</code> - value type</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>frame block</dd>
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<div class="block">Helper method that converts SystemDS matrix variable (<code>varname</code>) into a Array2DRowRealMatrix format,
which is useful in invoking Apache CommonsMath.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mb</code> - matrix object</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix as a commons-math3 Array2DRowRealMatrix</dd>
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<div class="block">Returns a string representation of a matrix</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mb</code> - matrix block</dd>
<dd><code>sparse</code> - if true, string will contain a table with row index, col index, value (where value != 0.0)
otherwise it will be a rectangular string with all values of the matrix block</dd>
<dd><code>separator</code> - Separator string between each element in a row, or between the columns in sparse format</dd>
<dd><code>lineseparator</code> - Separator string between each row</dd>
<dd><code>rowsToPrint</code> - maximum number of rows to print, -1 for all</dd>
<dd><code>colsToPrint</code> - maximum number of columns to print, -1 for all</dd>
<dd><code>decimal</code> - number of decimal places to print, -1 for default</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>matrix as a string</dd>
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int&nbsp;rowsToPrint,
int&nbsp;colsToPrint,
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<div class="block">Returns a string representation of a tensor</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tb</code> - tensor block</dd>
<dd><code>sparse</code> - if true, string will contain a table with row index, col index, value (where value != 0.0)
otherwise it will be a rectangular string with all values of the tensor block</dd>
<dd><code>separator</code> - Separator string between each element in a row, or between the columns in sparse format</dd>
<dd><code>lineseparator</code> - Separator string between each row</dd>
<dd><code>leftBorder</code> - Characters placed at the start of a new dimension level</dd>
<dd><code>rightBorder</code> - Characters placed at the end of a new dimension level</dd>
<dd><code>rowsToPrint</code> - maximum number of rows to print, -1 for all</dd>
<dd><code>colsToPrint</code> - maximum number of columns to print, -1 for all</dd>
<dd><code>decimal</code> - number of decimal places to print, -1 for default</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>tensor as a string</dd>
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