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<div class="subTitle">org.apache.mahout.math</div>
<h2 title="Class DenseMatrix" class="title">Class DenseMatrix</h2>
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<pre>public class <span class="typeNameLabel">DenseMatrix</span>
extends <a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></pre>
<div class="block">Matrix of doubles implemented using a 2-d array</div>
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<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.TransposeViewVector.html" title="class in org.apache.mahout.math">AbstractMatrix.TransposeViewVector</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#DenseMatrix-double:A:A-">DenseMatrix</a></span>(double[][]&nbsp;values)</code>
<div class="block">Construct a matrix from the given values</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#DenseMatrix-double:A:A-boolean-">DenseMatrix</a></span>(double[][]&nbsp;values,
boolean&nbsp;shallowCopy)</code>
<div class="block">Construct a matrix from the given values</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#DenseMatrix-int-int-">DenseMatrix</a></span>(int&nbsp;rows,
int&nbsp;columns)</code>
<div class="block">Constructs an empty matrix of the given size.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#assign-org.apache.mahout.math.DenseMatrix-">assign</a></span>(<a href="../../../../org/apache/mahout/math/DenseMatrix.html" title="class in org.apache.mahout.math">DenseMatrix</a>&nbsp;matrix)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#assign-double-">assign</a></span>(double&nbsp;value)</code>
<div class="block">Assign the value to all elements of the receiver</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#assignColumn-int-org.apache.mahout.math.Vector-">assignColumn</a></span>(int&nbsp;column,
<a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a>&nbsp;other)</code>
<div class="block">Assign the other vector values to the column of the receiver</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#assignRow-int-org.apache.mahout.math.Vector-">assignRow</a></span>(int&nbsp;row,
<a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a>&nbsp;other)</code>
<div class="block">Assign the other vector values to the row of the receiver</div>
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</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#clone--">clone</a></span>()</code>
<div class="block">Return a copy of the recipient</div>
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</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>double[][]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#getBackingStructure--">getBackingStructure</a></span>()</code>
<div class="block">Returns the backing array</div>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/flavor/MatrixFlavor.html" title="interface in org.apache.mahout.math.flavor">MatrixFlavor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#getFlavor--">getFlavor</a></span>()</code>
<div class="block">Get matrix structural flavor (operations performance hints).</div>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#getQuick-int-int-">getQuick</a></span>(int&nbsp;row,
int&nbsp;column)</code>
<div class="block">Return the value at the given indexes, without checking bounds</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#like--">like</a></span>()</code>
<div class="block">Return an empty matrix of the same underlying class as the receiver</div>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#like-int-int-">like</a></span>(int&nbsp;rows,
int&nbsp;columns)</code>
<div class="block">Returns an empty matrix of the same underlying class as the receiver and of the specified size.</div>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#setQuick-int-int-double-">setQuick</a></span>(int&nbsp;row,
int&nbsp;column,
double&nbsp;value)</code>
<div class="block">Set the value at the given index, without checking bounds</div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#viewPart-int:A-int:A-">viewPart</a></span>(int[]&nbsp;offset,
int[]&nbsp;size)</code>
<div class="block">Return a view into part of a matrix.</div>
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<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#viewPart-int-int-int-int-">viewPart</a></span>(int&nbsp;rowOffset,
int&nbsp;rowsRequested,
int&nbsp;columnOffset,
int&nbsp;columnsRequested)</code>
<div class="block">Return a view into part of a matrix.</div>
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</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/DenseMatrix.html#viewRow-int-">viewRow</a></span>(int&nbsp;row)</code>
<div class="block">Returns a view of a row.</div>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li>
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<h4>DenseMatrix</h4>
<pre>public&nbsp;DenseMatrix(double[][]&nbsp;values)</pre>
<div class="block">Construct a matrix from the given values</div>
<dl>
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<dd><code>values</code> - a double[][]</dd>
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<pre>public&nbsp;DenseMatrix(double[][]&nbsp;values,
boolean&nbsp;shallowCopy)</pre>
<div class="block">Construct a matrix from the given values</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>values</code> - a double[][]</dd>
<dd><code>shallowCopy</code> - directly use the supplied array?</dd>
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<pre>public&nbsp;DenseMatrix(int&nbsp;rows,
int&nbsp;columns)</pre>
<div class="block">Constructs an empty matrix of the given size.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rows</code> - The number of rows in the result.</dd>
<dd><code>columns</code> - The number of columns in the result.</dd>
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<pre>public&nbsp;double[][]&nbsp;getBackingStructure()</pre>
<div class="block">Returns the backing array</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>double[][]</dd>
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<h4>clone</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;clone()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#clone--">Matrix</a></code></span></div>
<div class="block">Return a copy of the recipient</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#clone--">clone</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#clone--">clone</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new Matrix</dd>
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<h4>getQuick</h4>
<pre>public&nbsp;double&nbsp;getQuick(int&nbsp;row,
int&nbsp;column)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#getQuick-int-int-">Matrix</a></code></span></div>
<div class="block">Return the value at the given indexes, without checking bounds</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>row</code> - an int row index</dd>
<dd><code>column</code> - an int column index</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the double at the index</dd>
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<h4>like</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;like()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#like--">Matrix</a></code></span></div>
<div class="block">Return an empty matrix of the same underlying class as the receiver</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>a Matrix</dd>
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<h4>like</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;like(int&nbsp;rows,
int&nbsp;columns)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#like-int-int-">Matrix</a></code></span></div>
<div class="block">Returns an empty matrix of the same underlying class as the receiver and of the specified size.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rows</code> - the int number of rows</dd>
<dd><code>columns</code> - the int number of columns</dd>
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<pre>public&nbsp;void&nbsp;setQuick(int&nbsp;row,
int&nbsp;column,
double&nbsp;value)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#setQuick-int-int-double-">Matrix</a></code></span></div>
<div class="block">Set the value at the given index, without checking bounds</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>row</code> - an int row index into the receiver</dd>
<dd><code>column</code> - an int column index into the receiver</dd>
<dd><code>value</code> - a double value to set</dd>
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<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;viewPart(int[]&nbsp;offset,
int[]&nbsp;size)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#viewPart-int:A-int:A-">Matrix</a></code></span></div>
<div class="block">Return a view into part of a matrix. Changes to the view will change the
original matrix.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#viewPart-int:A-int:A-">viewPart</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#viewPart-int:A-int:A-">viewPart</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>offset</code> - an int[2] offset into the receiver</dd>
<dd><code>size</code> - the int[2] size of the desired result</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a matrix that shares storage with part of the original matrix.</dd>
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<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;viewPart(int&nbsp;rowOffset,
int&nbsp;rowsRequested,
int&nbsp;columnOffset,
int&nbsp;columnsRequested)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#viewPart-int-int-int-int-">Matrix</a></code></span></div>
<div class="block">Return a view into part of a matrix. Changes to the view will change the
original matrix.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#viewPart-int-int-int-int-">viewPart</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#viewPart-int-int-int-int-">viewPart</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rowOffset</code> - The first row of the view</dd>
<dd><code>rowsRequested</code> - The number of rows in the view</dd>
<dd><code>columnOffset</code> - The first column in the view</dd>
<dd><code>columnsRequested</code> - The number of columns in the view</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a matrix that shares storage with part of the original matrix.</dd>
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<h4>assign</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;assign(double&nbsp;value)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#assign-double-">Matrix</a></code></span></div>
<div class="block">Assign the value to all elements of the receiver</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#assign-double-">assign</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#assign-double-">assign</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - a double value</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the modified receiver</dd>
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<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;assign(<a href="../../../../org/apache/mahout/math/DenseMatrix.html" title="class in org.apache.mahout.math">DenseMatrix</a>&nbsp;matrix)</pre>
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<h4>assignColumn</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;assignColumn(int&nbsp;column,
<a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a>&nbsp;other)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#assignColumn-int-org.apache.mahout.math.Vector-">Matrix</a></code></span></div>
<div class="block">Assign the other vector values to the column of the receiver</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>column</code> - the int row to assign</dd>
<dd><code>other</code> - a Vector</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the modified receiver</dd>
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<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a>&nbsp;assignRow(int&nbsp;row,
<a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a>&nbsp;other)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#assignRow-int-org.apache.mahout.math.Vector-">Matrix</a></code></span></div>
<div class="block">Assign the other vector values to the row of the receiver</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>row</code> - the int row to assign</dd>
<dd><code>other</code> - a Vector</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the modified receiver</dd>
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<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/Vector.html" title="interface in org.apache.mahout.math">Vector</a>&nbsp;viewRow(int&nbsp;row)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#viewRow-int-">AbstractMatrix</a></code></span></div>
<div class="block">Returns a view of a row. Changes to the view will affect the original.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#viewRow-int-">viewRow</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#viewRow-int-">viewRow</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>row</code> - Which row to return.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A vector that references the desired row.</dd>
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<h4>getFlavor</h4>
<pre>public&nbsp;<a href="../../../../org/apache/mahout/math/flavor/MatrixFlavor.html" title="interface in org.apache.mahout.math.flavor">MatrixFlavor</a>&nbsp;getFlavor()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html#getFlavor--">Matrix</a></code></span></div>
<div class="block">Get matrix structural flavor (operations performance hints). This is optional operation, may
throw <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang"><code>UnsupportedOperationException</code></a>.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/Matrix.html#getFlavor--">getFlavor</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/mahout/math/Matrix.html" title="interface in org.apache.mahout.math">Matrix</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html#getFlavor--">getFlavor</a></code>&nbsp;in class&nbsp;<code><a href="../../../../org/apache/mahout/math/AbstractMatrix.html" title="class in org.apache.mahout.math">AbstractMatrix</a></code></dd>
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