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<div class="subTitle">org.apache.commons.math3.genetics</div>
<h2 title="Class UniformCrossover" class="title">Class UniformCrossover<T></h2>
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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>
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<pre>public class <span class="strong">UniformCrossover<T></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>
implements <a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a></pre>
<div class="block">Perform Uniform Crossover [UX] on the specified chromosomes. A fixed mixing
ratio is used to combine genes from the first and second parents, e.g. using a
ratio of 0.5 would result in approximately 50% of genes coming from each
parent. This is typically a poor method of crossover, but empirical evidence
suggests that it is more exploratory and results in a larger part of the
problem space being searched.
<p>
This crossover policy evaluates each gene of the parent chromosomes by chosing a
uniform random number <code>p</code> in the range [0, 1]. If <code>p</code> < <code>ratio</code>,
the parent genes are swapped. This means with a ratio of 0.7, 30% of the genes from the
first parent and 70% from the second parent will be selected for the first offspring (and
vice versa for the second offspring).
<p>
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">See Also:</span></dt><dd><a href="http://en.wikipedia.org/wiki/Crossover_%28genetic_algorithm%29">Crossover techniques (Wikipedia)</a>,
<a href="http://www.obitko.com/tutorials/genetic-algorithms/crossover-mutation.php">Crossover (Obitko.com)</a>,
<a href="http://www.tomaszgwiazda.com/uniformX.htm">Uniform crossover</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/UniformCrossover.html#UniformCrossover(double)">UniformCrossover</a></strong>(double ratio)</code>
<div class="block">Creates a new <a href="../../../../../org/apache/commons/math3/genetics/UniformCrossover.html" title="class in org.apache.commons.math3.genetics"><code>UniformCrossover</code></a> policy using the given mixing ratio.</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/UniformCrossover.html#crossover(org.apache.commons.math3.genetics.Chromosome,%20org.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">Perform a crossover operation on the given chromosomes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/UniformCrossover.html#getRatio()">getRatio</a></strong>()</code>
<div class="block">Returns the mixing ratio 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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<h4>UniformCrossover</h4>
<pre>public UniformCrossover(double ratio)
throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Creates a new <a href="../../../../../org/apache/commons/math3/genetics/UniformCrossover.html" title="class in org.apache.commons.math3.genetics"><code>UniformCrossover</code></a> policy using the given mixing ratio.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>ratio</code> - the mixing ratio</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></code> - if the mixing ratio is outside the [0, 1] range</dd></dl>
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<pre>public double getRatio()</pre>
<div class="block">Returns the mixing ratio 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 mixing ratio</dd></dl>
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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">Perform a crossover operation on the given chromosomes.</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,%20org.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> - the first chromosome.</dd><dd><code>second</code> - the second chromosome.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the pair of new chromosomes that resulted from the crossover.</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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