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<h2 title="Interface PivotingStrategyInterface" class="title">Interface PivotingStrategyInterface</h2>
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<pre>public interface <span class="strong">PivotingStrategyInterface</span></pre>
<div class="block">A strategy to pick a pivoting index of an array for doing partitioning.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>3.4</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/math3/util/MedianOf3PivotingStrategy.html" title="class in org.apache.commons.math3.util"><code>MedianOf3PivotingStrategy</code></a>,
<a href="../../../../../org/apache/commons/math3/util/RandomPivotingStrategy.html" title="class in org.apache.commons.math3.util"><code>RandomPivotingStrategy</code></a>,
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/PivotingStrategyInterface.html#pivotIndex(double[],%20int,%20int)">pivotIndex</a></strong>(double[] work,
int begin,
int end)</code>
<div class="block">Find pivot index of the array so that partition and K<sup>th</sup>
element selection can be made</div>
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<h4>pivotIndex</h4>
<pre>int pivotIndex(double[] work,
int begin,
int end)
throws <a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre>
<div class="block">Find pivot index of the array so that partition and K<sup>th</sup>
element selection can be made</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>work</code> - data array</dd><dd><code>begin</code> - index of the first element of the slice</dd><dd><code>end</code> - index after the last element of the slice</dd>
<dt><span class="strong">Returns:</span></dt><dd>the index of the pivot element chosen between the
first and the last element of the array slice</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - when indices exceeds range</dd></dl>
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