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| <div class="subTitle">org.apache.commons.math3.util</div> |
| <h2 title="Class Combinations" class="title">Class Combinations</h2> |
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| <pre>public class <span class="strong">Combinations</span> |
| extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><int[]></pre> |
| <div class="block">Utility to create <a href="http://en.wikipedia.org/wiki/Combination"> |
| combinations</a> <code>(n, k)</code> of <code>k</code> elements in a set of |
| <code>n</code> elements.</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>3.3</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: Combinations.java 1591835 2014-05-02 09:04:01Z tn $</dd></dl> |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/util/Combinations.html#Combinations(int, int)">Combinations</a></strong>(int n, |
| int k)</code> |
| <div class="block">Creates an instance whose range is the k-element subsets of |
| {0, ..., n - 1} represented as <code>int[]</code> arrays.</div> |
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| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><int[]></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/Combinations.html#comparator()">comparator</a></strong>()</code> |
| <div class="block">Defines a lexicographic ordering of combinations.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/Combinations.html#getK()">getK</a></strong>()</code> |
| <div class="block">Gets the number of elements in each combination.</div> |
| </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/Combinations.html#getN()">getN</a></strong>()</code> |
| <div class="block">Gets the size of the set from which combinations are drawn.</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><int[]></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/util/Combinations.html#iterator()">iterator</a></strong>()</code></td> |
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| <h4>Combinations</h4> |
| <pre>public Combinations(int n, |
| int k)</pre> |
| <div class="block">Creates an instance whose range is the k-element subsets of |
| {0, ..., n - 1} represented as <code>int[]</code> arrays. |
| <p> |
| The iteration order is lexicographic: the arrays returned by the |
| <a href="../../../../../org/apache/commons/math3/util/Combinations.html#iterator()"><code>iterator</code></a> are sorted in descending order and |
| they are visited in lexicographic order with significance from |
| right to left. |
| For example, <code>new Combinations(4, 2).iterator()</code> returns |
| an iterator that will generate the following sequence of arrays |
| on successive calls to |
| <code>next()</code>:<br/> |
| <code>[0, 1], [0, 2], [1, 2], [0, 3], [1, 3], [2, 3]</code> |
| </p> |
| If <code>k == 0</code> an iterator containing an empty array is returned; |
| if <code>k == n</code> an iterator containing [0, ..., n - 1] is returned.</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">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 < 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 > n</code>.</dd></dl> |
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| <pre>public int getN()</pre> |
| <div class="block">Gets the size of the set from which combinations are drawn.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the size of the universe.</dd></dl> |
| </li> |
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| <pre>public int getK()</pre> |
| <div class="block">Gets the number of elements in each combination.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the size of the subsets to be enumerated.</dd></dl> |
| </li> |
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| <a name="iterator()"> |
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| <h4>iterator</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a><int[]> iterator()</pre> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true#iterator()" title="class or interface in java.lang">iterator</a></code> in interface <code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><int[]></code></dd> |
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| <h4>comparator</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><int[]> comparator()</pre> |
| <div class="block">Defines a lexicographic ordering of combinations. |
| The returned comparator allows to compare any two combinations |
| that can be produced by this instance's <a href="../../../../../org/apache/commons/math3/util/Combinations.html#iterator()"><code>iterator</code></a>. |
| Its <code>compare(int[],int[])</code> method will throw exceptions if |
| passed combinations that are inconsistent with this instance: |
| <ul> |
| <li><code>DimensionMismatchException</code> if the array lengths are not |
| equal to <code>k</code>,</li> |
| <li><code>OutOfRangeException</code> if an element of the array is not |
| within the interval [0, <code>n</code>).</li> |
| </ul></div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>a lexicographic comparator.</dd></dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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