api/core/snapshot/apidocs/com/yahoo/sketches/QuickSelect.html - datasketches - Git at Google

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 <div class="subTitle">com.yahoo.sketches</div>
 <h2 title="Class QuickSelect" class="title">Class QuickSelect</h2>
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 <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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 <pre>public final class <span class="typeNameLabel">QuickSelect</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">QuickSelect algorithm improved from Sedgewick. Gets the kth order value
  (1-based or 0-based) from the array.
  Warning! This changes the ordering of elements in the given array!<br>
  Also see:<br>
  blog.teamleadnet.com/2012/07/quick-select-algorithm-find-kth-element.html<br>
  See QuickSelectTest for examples and testNG tests.</div>
 <dl>
 <dt><span class="simpleTagLabel">Author:</span></dt>
 <dd>Lee Rhodes</dd>
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 <td class="colFirst"><code>static double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#select-double:A-int-int-int-">select</a></span>(double[]&nbsp;arr,
       int&nbsp;lo,
       int&nbsp;hi,
       int&nbsp;pivot)</code>
 <div class="block">Gets the 0-based kth order statistic from the array.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#select-long:A-int-int-int-">select</a></span>(long[]&nbsp;arr,
       int&nbsp;lo,
       int&nbsp;hi,
       int&nbsp;pivot)</code>
 <div class="block">Gets the 0-based kth order statistic from the array.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>static double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectExcludingZeros-double:A-int-int-">selectExcludingZeros</a></span>(double[]&nbsp;arr,
                     int&nbsp;nonZeros,
                     int&nbsp;pivot)</code>
 <div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
  array.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectExcludingZeros-long:A-int-int-">selectExcludingZeros</a></span>(long[]&nbsp;arr,
                     int&nbsp;nonZeros,
                     int&nbsp;pivot)</code>
 <div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
  array.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>static double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectIncludingZeros-double:A-int-">selectIncludingZeros</a></span>(double[]&nbsp;arr,
                     int&nbsp;pivot)</code>
 <div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
  array.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectIncludingZeros-long:A-int-">selectIncludingZeros</a></span>(long[]&nbsp;arr,
                     int&nbsp;pivot)</code>
 <div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
  array.</div>
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 <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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 <h4>select</h4>
 <pre>public static&nbsp;long&nbsp;select(long[]&nbsp;arr,
                           int&nbsp;lo,
                           int&nbsp;hi,
                           int&nbsp;pivot)</pre>
 <div class="block">Gets the 0-based kth order statistic from the array. Warning! This changes the ordering
  of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The array to be re-arranged.</dd>
 <dd><code>lo</code> - The lowest 0-based index to be considered.</dd>
 <dd><code>hi</code> - The highest 0-based index to be considered.</dd>
 <dd><code>pivot</code> - The 0-based index of the value to pivot on.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (n)th element where n is 0-based.</dd>
 </dl>
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 <h4>selectIncludingZeros</h4>
 <pre>public static&nbsp;long&nbsp;selectIncludingZeros(long[]&nbsp;arr,
                                         int&nbsp;pivot)</pre>
 <div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
  array. Warning! This changes the ordering of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The hash array.</dd>
 <dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
  After the operation all values below this 1-based index will be less than this value
  and all values above this index will be greater. The 0-based index of the pivot will be
  pivot-1.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (N)th element including zeros, where N is 1-based.</dd>
 </dl>
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 <pre>public static&nbsp;long&nbsp;selectExcludingZeros(long[]&nbsp;arr,
                                         int&nbsp;nonZeros,
                                         int&nbsp;pivot)</pre>
 <div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
  array. Warning! This changes the ordering of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The hash array.</dd>
 <dd><code>nonZeros</code> - The number of non-zero values in the array.</dd>
 <dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
  After the operation all values below this 1-based index will be less than this value
  and all values above this index will be greater. The 0-based index of the pivot will be
  pivot+arr.length-nonZeros-1.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (N)th element excluding zeros, where N is 1-based.</dd>
 </dl>
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 <h4>select</h4>
 <pre>public static&nbsp;double&nbsp;select(double[]&nbsp;arr,
                             int&nbsp;lo,
                             int&nbsp;hi,
                             int&nbsp;pivot)</pre>
 <div class="block">Gets the 0-based kth order statistic from the array. Warning! This changes the ordering
  of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The array to be re-arranged.</dd>
 <dd><code>lo</code> - The lowest 0-based index to be considered.</dd>
 <dd><code>hi</code> - The highest 0-based index to be considered.</dd>
 <dd><code>pivot</code> - The 0-based smallest value to pivot on.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (n)th element where n is 0-based.</dd>
 </dl>
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 <h4>selectIncludingZeros</h4>
 <pre>public static&nbsp;double&nbsp;selectIncludingZeros(double[]&nbsp;arr,
                                           int&nbsp;pivot)</pre>
 <div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
  array. Warning! This changes the ordering of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The hash array.</dd>
 <dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
  After the operation all values below this 1-based index will be less than this value
  and all values above this index will be greater. The 0-based index of the pivot will be
  pivot-1.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (N)th element including zeros, where N is 1-based.</dd>
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 <pre>public static&nbsp;double&nbsp;selectExcludingZeros(double[]&nbsp;arr,
                                           int&nbsp;nonZeros,
                                           int&nbsp;pivot)</pre>
 <div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
  array. Warning! This changes the ordering of elements in the given array!</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>arr</code> - The hash array.</dd>
 <dd><code>nonZeros</code> - The number of non-zero values in the array.</dd>
 <dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
  After the operation all values below this 1-based index will be less than this value
  and all values above this index will be greater. The 0-based index of the pivot will be
  pivot+arr.length-nonZeros-1.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The value of the smallest (N)th element excluding zeros, where N is 1-based.</dd>
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	<div class="subTitle">com.yahoo.sketches</div>
	<h2 title="Class QuickSelect" class="title">Class QuickSelect</h2>
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	<ul class="inheritance">
	<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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	<ul class="inheritance">
	<li>com.yahoo.sketches.QuickSelect</li>
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	<pre>public final class <span class="typeNameLabel">QuickSelect</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">QuickSelect algorithm improved from Sedgewick. Gets the kth order value
	(1-based or 0-based) from the array.
	Warning! This changes the ordering of elements in the given array!<br>
	Also see:<br>
	blog.teamleadnet.com/2012/07/quick-select-algorithm-find-kth-element.html<br>
	See QuickSelectTest for examples and testNG tests.</div>
	<dl>
	<dt><span class="simpleTagLabel">Author:</span></dt>
	<dd>Lee Rhodes</dd>
	</dl>
	</li>
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	<h3>Method Summary</h3>
	<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
	<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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 double</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#select-double:A-int-int-int-">select</a></span>(double[] arr,
	int lo,
	int hi,
	int pivot)</code>
	<div class="block">Gets the 0-based kth order statistic from the array.</div>
	</td>
	</tr>
	<tr id="i1" class="rowColor">
	<td class="colFirst"><code>static long</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#select-long:A-int-int-int-">select</a></span>(long[] arr,
	int lo,
	int hi,
	int pivot)</code>
	<div class="block">Gets the 0-based kth order statistic from the array.</div>
	</td>
	</tr>
	<tr id="i2" class="altColor">
	<td class="colFirst"><code>static double</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectExcludingZeros-double:A-int-int-">selectExcludingZeros</a></span>(double[] arr,
	int nonZeros,
	int pivot)</code>
	<div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
	array.</div>
	</td>
	</tr>
	<tr id="i3" class="rowColor">
	<td class="colFirst"><code>static long</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectExcludingZeros-long:A-int-int-">selectExcludingZeros</a></span>(long[] arr,
	int nonZeros,
	int pivot)</code>
	<div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
	array.</div>
	</td>
	</tr>
	<tr id="i4" class="altColor">
	<td class="colFirst"><code>static double</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectIncludingZeros-double:A-int-">selectIncludingZeros</a></span>(double[] arr,
	int pivot)</code>
	<div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
	array.</div>
	</td>
	</tr>
	<tr id="i5" class="rowColor">
	<td class="colFirst"><code>static long</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/sketches/QuickSelect.html#selectIncludingZeros-long:A-int-">selectIncludingZeros</a></span>(long[] arr,
	int pivot)</code>
	<div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
	array.</div>
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	</tr>
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	<h3>Methods inherited from class java.lang.<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></h3>
	<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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	<h4>select</h4>
	<pre>public static long select(long[] arr,
	int lo,
	int hi,
	int pivot)</pre>
	<div class="block">Gets the 0-based kth order statistic from the array. Warning! This changes the ordering
	of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The array to be re-arranged.</dd>
	<dd><code>lo</code> - The lowest 0-based index to be considered.</dd>
	<dd><code>hi</code> - The highest 0-based index to be considered.</dd>
	<dd><code>pivot</code> - The 0-based index of the value to pivot on.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (n)th element where n is 0-based.</dd>
	</dl>
	</li>
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	<h4>selectIncludingZeros</h4>
	<pre>public static long selectIncludingZeros(long[] arr,
	int pivot)</pre>
	<div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
	array. Warning! This changes the ordering of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The hash array.</dd>
	<dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
	After the operation all values below this 1-based index will be less than this value
	and all values above this index will be greater. The 0-based index of the pivot will be
	pivot-1.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (N)th element including zeros, where N is 1-based.</dd>
	</dl>
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	<h4>selectExcludingZeros</h4>
	<pre>public static long selectExcludingZeros(long[] arr,
	int nonZeros,
	int pivot)</pre>
	<div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
	array. Warning! This changes the ordering of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The hash array.</dd>
	<dd><code>nonZeros</code> - The number of non-zero values in the array.</dd>
	<dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
	After the operation all values below this 1-based index will be less than this value
	and all values above this index will be greater. The 0-based index of the pivot will be
	pivot+arr.length-nonZeros-1.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (N)th element excluding zeros, where N is 1-based.</dd>
	</dl>
	</li>
	</ul>
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	<h4>select</h4>
	<pre>public static double select(double[] arr,
	int lo,
	int hi,
	int pivot)</pre>
	<div class="block">Gets the 0-based kth order statistic from the array. Warning! This changes the ordering
	of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The array to be re-arranged.</dd>
	<dd><code>lo</code> - The lowest 0-based index to be considered.</dd>
	<dd><code>hi</code> - The highest 0-based index to be considered.</dd>
	<dd><code>pivot</code> - The 0-based smallest value to pivot on.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (n)th element where n is 0-based.</dd>
	</dl>
	</li>
	</ul>
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	<h4>selectIncludingZeros</h4>
	<pre>public static double selectIncludingZeros(double[] arr,
	int pivot)</pre>
	<div class="block">Gets the 1-based kth order statistic from the array including any zero values in the
	array. Warning! This changes the ordering of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The hash array.</dd>
	<dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
	After the operation all values below this 1-based index will be less than this value
	and all values above this index will be greater. The 0-based index of the pivot will be
	pivot-1.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (N)th element including zeros, where N is 1-based.</dd>
	</dl>
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	<h4>selectExcludingZeros</h4>
	<pre>public static double selectExcludingZeros(double[] arr,
	int nonZeros,
	int pivot)</pre>
	<div class="block">Gets the 1-based kth order statistic from the array excluding any zero values in the
	array. Warning! This changes the ordering of elements in the given array!</div>
	<dl>
	<dt><span class="paramLabel">Parameters:</span></dt>
	<dd><code>arr</code> - The hash array.</dd>
	<dd><code>nonZeros</code> - The number of non-zero values in the array.</dd>
	<dd><code>pivot</code> - The 1-based index of the value that is chosen as the pivot for the array.
	After the operation all values below this 1-based index will be less than this value
	and all values above this index will be greater. The 0-based index of the pivot will be
	pivot+arr.length-nonZeros-1.</dd>
	<dt><span class="returnLabel">Returns:</span></dt>
	<dd>The value of the smallest (N)th element excluding zeros, where N is 1-based.</dd>
	</dl>
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