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| <div class="subTitle">org.apache.commons.math3.genetics</div> |
| <h2 title="Class NPointCrossover" class="title">Class NPointCrossover<T></h2> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.commons.math3.genetics.NPointCrossover<T></li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - generic type of the <a href="../../../../../org/apache/commons/math3/genetics/AbstractListChromosome.html" title="class in org.apache.commons.math3.genetics"><code>AbstractListChromosome</code></a>s for crossover</dd></dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public class <span class="strong">NPointCrossover<T></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="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a></pre> |
| <div class="block">N-point crossover policy. For each iteration a random crossover point is |
| selected and the first part from each parent is copied to the corresponding |
| child, and the second parts are copied crosswise. |
| |
| Example (2-point crossover): |
| <pre> |
| -C- denotes a crossover point |
| -C- -C- -C- -C- |
| p1 = (1 0 | 1 0 0 1 | 0 1 1) X p2 = (0 1 | 1 0 1 0 | 1 1 1) |
| \----/ \-------/ \-----/ \----/ \--------/ \-----/ |
| || (*) || || (**) || |
| VV (**) VV VV (*) VV |
| /----\ /--------\ /-----\ /----\ /--------\ /-----\ |
| c1 = (1 0 | 1 0 1 0 | 0 1 1) X c2 = (0 1 | 1 0 0 1 | 0 1 1) |
| </pre> |
| |
| This policy works only on <a href="../../../../../org/apache/commons/math3/genetics/AbstractListChromosome.html" title="class in org.apache.commons.math3.genetics"><code>AbstractListChromosome</code></a>, and therefore it |
| is parameterized by T. Moreover, the chromosomes must have same lengths.</div> |
| <dl><dt><span class="strong">Since:</span></dt> |
| <dd>3.1</dd> |
| <dt><span class="strong">Version:</span></dt> |
| <dd>$Id: NPointCrossover.java 1551014 2013-12-15 10:56:49Z tn $</dd></dl> |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/NPointCrossover.html#NPointCrossover(int)">NPointCrossover</a></strong>(int crossoverPoints)</code> |
| <div class="block">Creates a new <a href="../../../../../org/apache/commons/math3/genetics/NPointCrossover.html" title="class in org.apache.commons.math3.genetics"><code>NPointCrossover</code></a> policy using the given number of points.</div> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/genetics/ChromosomePair.html" title="class in org.apache.commons.math3.genetics">ChromosomePair</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/NPointCrossover.html#crossover(org.apache.commons.math3.genetics.Chromosome, org.apache.commons.math3.genetics.Chromosome)">crossover</a></strong>(<a href="../../../../../org/apache/commons/math3/genetics/Chromosome.html" title="class in org.apache.commons.math3.genetics">Chromosome</a> first, |
| <a href="../../../../../org/apache/commons/math3/genetics/Chromosome.html" title="class in org.apache.commons.math3.genetics">Chromosome</a> second)</code> |
| <div class="block">Performs a N-point crossover.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/NPointCrossover.html#getCrossoverPoints()">getCrossoverPoints</a></strong>()</code> |
| <div class="block">Returns the number of crossover points used by this <a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>CrossoverPolicy</code></a>.</div> |
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| <code><a href="http://docs.oracle.com/javase/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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/6/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>NPointCrossover</h4> |
| <pre>public NPointCrossover(int crossoverPoints) |
| throws <a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></pre> |
| <div class="block">Creates a new <a href="../../../../../org/apache/commons/math3/genetics/NPointCrossover.html" title="class in org.apache.commons.math3.genetics"><code>NPointCrossover</code></a> policy using the given number of points. |
| <p> |
| <b>Note</b>: the number of crossover points must be < <code>chromosome length - 1</code>. |
| This condition can only be checked at runtime, as the chromosome length is not known in advance.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>crossoverPoints</code> - the number of crossover points</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/NotStrictlyPositiveException.html" title="class in org.apache.commons.math3.exception">NotStrictlyPositiveException</a></code> - if the number of <code>crossoverPoints</code> is not strictly positive</dd></dl> |
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| <a name="getCrossoverPoints()"> |
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| <h4>getCrossoverPoints</h4> |
| <pre>public int getCrossoverPoints()</pre> |
| <div class="block">Returns the number of crossover points used by this <a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>CrossoverPolicy</code></a>.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the number of crossover points</dd></dl> |
| </li> |
| </ul> |
| <a name="crossover(org.apache.commons.math3.genetics.Chromosome, org.apache.commons.math3.genetics.Chromosome)"> |
| <!-- --> |
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| <h4>crossover</h4> |
| <pre>public <a href="../../../../../org/apache/commons/math3/genetics/ChromosomePair.html" title="class in org.apache.commons.math3.genetics">ChromosomePair</a> crossover(<a href="../../../../../org/apache/commons/math3/genetics/Chromosome.html" title="class in org.apache.commons.math3.genetics">Chromosome</a> first, |
| <a href="../../../../../org/apache/commons/math3/genetics/Chromosome.html" title="class in org.apache.commons.math3.genetics">Chromosome</a> second) |
| throws <a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a>, |
| <a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></pre> |
| <div class="block">Performs a N-point crossover. N random crossover points are selected and are used |
| to divide the parent chromosomes into segments. The segments are copied in alternate |
| order from the two parents to the corresponding child chromosomes. |
| |
| Example (2-point crossover): |
| <pre> |
| -C- denotes a crossover point |
| -C- -C- -C- -C- |
| p1 = (1 0 | 1 0 0 1 | 0 1 1) X p2 = (0 1 | 1 0 1 0 | 1 1 1) |
| \----/ \-------/ \-----/ \----/ \--------/ \-----/ |
| || (*) || || (**) || |
| VV (**) VV VV (*) VV |
| /----\ /--------\ /-----\ /----\ /--------\ /-----\ |
| c1 = (1 0 | 1 0 1 0 | 0 1 1) X c2 = (0 1 | 1 0 0 1 | 0 1 1) |
| </pre></div> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code><a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html#crossover(org.apache.commons.math3.genetics.Chromosome, org.apache.commons.math3.genetics.Chromosome)">crossover</a></code> in interface <code><a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a></code></dd> |
| <dt><span class="strong">Parameters:</span></dt><dd><code>first</code> - first parent (p1)</dd><dd><code>second</code> - second parent (p2)</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>pair of two children (c1,c2)</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> - iff one of the chromosomes is |
| not an instance of <a href="../../../../../org/apache/commons/math3/genetics/AbstractListChromosome.html" title="class in org.apache.commons.math3.genetics"><code>AbstractListChromosome</code></a></dd> |
| <dd><code><a href="../../../../../org/apache/commons/math3/exception/DimensionMismatchException.html" title="class in org.apache.commons.math3.exception">DimensionMismatchException</a></code> - if the length of the two chromosomes is different</dd></dl> |
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