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+<div class="header">
+<div class="subTitle">org.apache.commons.math3.util</div>
+<h2 title="Class CombinatoricsUtils" class="title">Class CombinatoricsUtils</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.commons.math3.util.CombinatoricsUtils</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<hr>
+<br>
+<pre>public final class <span class="strong">CombinatoricsUtils</span>
+extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
+<div class="block">Combinatorial utilities.</div>
+<dl><dt><span class="strong">Since:</span></dt>
+ <dd>3.3</dd></dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
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+</a>
+<h3>Method Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#binomialCoefficient(int,%20int)">binomialCoefficient</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Returns an exact representation of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#binomialCoefficientDouble(int,%20int)">binomialCoefficientDouble</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Returns a <code>double</code> representation of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#binomialCoefficientLog(int,%20int)">binomialCoefficientLog</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Returns the natural <code>log</code> of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#checkBinomial(int,%20int)">checkBinomial</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Check binomial preconditions.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;int[]&gt;</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#combinationsIterator(int,%20int)">combinationsIterator</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Returns an iterator whose range is the k-element subsets of {0, ..., n - 1}
+ represented as <code>int[]</code> arrays.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#factorial(int)">factorial</a></strong>(int&nbsp;n)</code>
+<div class="block">Returns n!.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#factorialDouble(int)">factorialDouble</a></strong>(int&nbsp;n)</code>
+<div class="block">Compute n!, the<a href="http://mathworld.wolfram.com/Factorial.html">
+ factorial</a> of <code>n</code> (the product of the numbers 1 to n), as a
+ <code>double</code>.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>static double</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#factorialLog(int)">factorialLog</a></strong>(int&nbsp;n)</code>
+<div class="block">Compute the natural logarithm of the factorial of <code>n</code>.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/CombinatoricsUtils.html#stirlingS2(int,%20int)">stirlingS2</a></strong>(int&nbsp;n,
+ int&nbsp;k)</code>
+<div class="block">Returns the <a
+ href="http://mathworld.wolfram.com/StirlingNumberoftheSecondKind.html">
+ Stirling number of the second kind</a>, "<code>S(n,k)</code>", the number of
+ ways of partitioning an <code>n</code>-element set into <code>k</code> non-empty
+ subsets.</div>
+</td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
+<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
+</ul>
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+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_detail">
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+<h3>Method Detail</h3>
+<a name="binomialCoefficient(int, int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>binomialCoefficient</h4>
+<pre>public static&nbsp;long&nbsp;binomialCoefficient(int&nbsp;n,
+ int&nbsp;k)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
+<div class="block">Returns an exact representation of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.
+ <p>
+ <Strong>Preconditions</strong>:
+ <ul>
+ <li> <code>0 &lt;= k &lt;= n </code> (otherwise
+ <code>MathIllegalArgumentException</code> is thrown)</li>
+ <li> The result is small enough to fit into a <code>long</code>. The
+ largest value of <code>n</code> for which all coefficients are
+ <code>&lt; Long.MAX_VALUE</code> is 66. If the computed value exceeds
+ <code>Long.MAX_VALUE</code> a <code>MathArithMeticException</code> is
+ thrown.</li>
+ </ul></p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the size of the set</dd><dd><code>k</code> - the size of the subsets to be counted</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n choose k</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the result is too large to be
+ represented by a long integer.</dd></dl>
+</li>
+</ul>
+<a name="binomialCoefficientDouble(int, int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>binomialCoefficientDouble</h4>
+<pre>public static&nbsp;double&nbsp;binomialCoefficientDouble(int&nbsp;n,
+ int&nbsp;k)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
+<div class="block">Returns a <code>double</code> representation of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.
+ <p>
+ <Strong>Preconditions</strong>:
+ <ul>
+ <li> <code>0 &lt;= k &lt;= n </code> (otherwise
+ <code>IllegalArgumentException</code> is thrown)</li>
+ <li> The result is small enough to fit into a <code>double</code>. The
+ largest value of <code>n</code> for which all coefficients are less than
+ Double.MAX_VALUE is 1029. If the computed value exceeds Double.MAX_VALUE,
+ Double.POSITIVE_INFINITY is returned</li>
+ </ul></p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the size of the set</dd><dd><code>k</code> - the size of the subsets to be counted</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n choose k</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the result is too large to be
+ represented by a long integer.</dd></dl>
+</li>
+</ul>
+<a name="binomialCoefficientLog(int, int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>binomialCoefficientLog</h4>
+<pre>public static&nbsp;double&nbsp;binomialCoefficientLog(int&nbsp;n,
+ int&nbsp;k)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
+<div class="block">Returns the natural <code>log</code> of the <a
+ href="http://mathworld.wolfram.com/BinomialCoefficient.html"> Binomial
+ Coefficient</a>, "<code>n choose k</code>", the number of
+ <code>k</code>-element subsets that can be selected from an
+ <code>n</code>-element set.
+ <p>
+ <Strong>Preconditions</strong>:
+ <ul>
+ <li> <code>0 &lt;= k &lt;= n </code> (otherwise
+ <code>MathIllegalArgumentException</code> is thrown)</li>
+ </ul></p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the size of the set</dd><dd><code>k</code> - the size of the subsets to be counted</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n choose k</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the result is too large to be
+ represented by a long integer.</dd></dl>
+</li>
+</ul>
+<a name="factorial(int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>factorial</h4>
+<pre>public static&nbsp;long&nbsp;factorial(int&nbsp;n)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
+<div class="block">Returns n!. Shorthand for <code>n</code> <a
+ href="http://mathworld.wolfram.com/Factorial.html"> Factorial</a>, the
+ product of the numbers <code>1,...,n</code>.
+ <p>
+ <Strong>Preconditions</strong>:
+ <ul>
+ <li> <code>n &gt;= 0</code> (otherwise
+ <code>MathIllegalArgumentException</code> is thrown)</li>
+ <li> The result is small enough to fit into a <code>long</code>. The
+ largest value of <code>n</code> for which <code>n!</code> does not exceed
+ Long.MAX_VALUE} is 20. If the computed value exceeds <code>Long.MAX_VALUE</code>
+ an <code>MathArithMeticException </code> is thrown.</li>
+ </ul>
+ </p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - argument</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n!</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if the result is too large to be represented
+ by a <code>long</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if <code>n &gt; 20</code>: The factorial value is too
+ large to fit in a <code>long</code>.</dd></dl>
+</li>
+</ul>
+<a name="factorialDouble(int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>factorialDouble</h4>
+<pre>public static&nbsp;double&nbsp;factorialDouble(int&nbsp;n)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></pre>
+<div class="block">Compute n!, the<a href="http://mathworld.wolfram.com/Factorial.html">
+ factorial</a> of <code>n</code> (the product of the numbers 1 to n), as a
+ <code>double</code>.
+ The result should be small enough to fit into a <code>double</code>: The
+ largest <code>n</code> for which <code>n!</code> does not exceed
+ <code>Double.MAX_VALUE</code> is 170. If the computed value exceeds
+ <code>Double.MAX_VALUE</code>, <code>Double.POSITIVE_INFINITY</code> is returned.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Argument.</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n!</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd></dl>
+</li>
+</ul>
+<a name="factorialLog(int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>factorialLog</h4>
+<pre>public static&nbsp;double&nbsp;factorialLog(int&nbsp;n)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></pre>
+<div class="block">Compute the natural logarithm of the factorial of <code>n</code>.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Argument.</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>n!</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd></dl>
+</li>
+</ul>
+<a name="stirlingS2(int, int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>stirlingS2</h4>
+<pre>public static&nbsp;long&nbsp;stirlingS2(int&nbsp;n,
+ int&nbsp;k)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></pre>
+<div class="block">Returns the <a
+ href="http://mathworld.wolfram.com/StirlingNumberoftheSecondKind.html">
+ Stirling number of the second kind</a>, "<code>S(n,k)</code>", the number of
+ ways of partitioning an <code>n</code>-element set into <code>k</code> non-empty
+ subsets.
+ <p>
+ The preconditions are <code>0 &lt;= k &lt;= n </code> (otherwise
+ <code>NotPositiveException</code> is thrown)
+ </p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - the size of the set</dd><dd><code>k</code> - the number of non-empty subsets</dd>
+<dt><span class="strong">Returns:</span></dt><dd><code>S(n,k)</code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>k &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathArithmeticException.html" title="class in org.apache.commons.math3.exception">MathArithmeticException</a></code> - if some overflow happens, typically for n exceeding 25 and
+ k between 20 and n-2 (S(n,n-1) is handled specifically and does not overflow)</dd><dt><span class="strong">Since:</span></dt>
+ <dd>3.1</dd></dl>
+</li>
+</ul>
+<a name="combinationsIterator(int, int)">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>combinationsIterator</h4>
+<pre>public static&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;int[]&gt;&nbsp;combinationsIterator(int&nbsp;n,
+ int&nbsp;k)</pre>
+<div class="block">Returns an iterator whose range is the k-element subsets of {0, ..., n - 1}
+ represented as <code>int[]</code> arrays.
+ <p>
+ The arrays returned by the iterator are sorted in descending order and
+ they are visited in lexicographic order with significance from right to
+ left. For example, combinationsIterator(4, 2) returns an Iterator that
+ will generate the following sequence of arrays on successive calls to
+ <code>next()</code>:</p><p>
+ <code>[0, 1], [0, 2], [1, 2], [0, 3], [1, 3], [2, 3]</code>
+ </p><p>
+ If <code>k == 0</code> an Iterator containing an empty array is returned and
+ if <code>k == n</code> an Iterator containing [0, ..., n -1] is returned.</p></div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Size of the set from which subsets are selected.</dd><dd><code>k</code> - Size of the subsets to be enumerated.</dd>
+<dt><span class="strong">Returns:</span></dt><dd>an <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util"><code>iterator</code></a> over the k-sets in n.</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd></dl>
+</li>
+</ul>
+<a name="checkBinomial(int, int)">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>checkBinomial</h4>
+<pre>public static&nbsp;void&nbsp;checkBinomial(int&nbsp;n,
+ int&nbsp;k)
+ throws <a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a>,
+ <a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></pre>
+<div class="block">Check binomial preconditions.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Size of the set.</dd><dd><code>k</code> - Size of the subsets to be counted.</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NotPositiveException.html" title="class in org.apache.commons.math3.exception">NotPositiveException</a></code> - if <code>n &lt; 0</code>.</dd>
+<dd><code><a href="../../../../../org/apache/commons/math3/exception/NumberIsTooLargeException.html" title="class in org.apache.commons.math3.exception">NumberIsTooLargeException</a></code> - if <code>k &gt; n</code>.</dd></dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
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