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<div class="subTitle">org.apache.commons.math3.genetics</div>
<h2 title="Class GeneticAlgorithm" class="title">Class GeneticAlgorithm</h2>
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<li>org.apache.commons.math3.genetics.GeneticAlgorithm</li>
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<pre>public class <span class="strong">GeneticAlgorithm</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></pre>
<div class="block">Implementation of a genetic algorithm. All factors that govern the operation
of the algorithm can be configured for a specific problem.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="strong">Version:</span></dt>
<dd>$Id: GeneticAlgorithm.java 1416643 2012-12-03 19:37:14Z tn $</dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#GeneticAlgorithm(org.apache.commons.math3.genetics.CrossoverPolicy, double, org.apache.commons.math3.genetics.MutationPolicy, double, org.apache.commons.math3.genetics.SelectionPolicy)">GeneticAlgorithm</a></strong>(<a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a>&nbsp;crossoverPolicy,
double&nbsp;crossoverRate,
<a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics">MutationPolicy</a>&nbsp;mutationPolicy,
double&nbsp;mutationRate,
<a href="../../../../../org/apache/commons/math3/genetics/SelectionPolicy.html" title="interface in org.apache.commons.math3.genetics">SelectionPolicy</a>&nbsp;selectionPolicy)</code>
<div class="block">Create a new genetic algorithm.</div>
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<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><a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#evolve(org.apache.commons.math3.genetics.Population, org.apache.commons.math3.genetics.StoppingCondition)">evolve</a></strong>(<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;initial,
<a href="../../../../../org/apache/commons/math3/genetics/StoppingCondition.html" title="interface in org.apache.commons.math3.genetics">StoppingCondition</a>&nbsp;condition)</code>
<div class="block">Evolve the given population.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getCrossoverPolicy()">getCrossoverPolicy</a></strong>()</code>
<div class="block">Returns the crossover policy.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getCrossoverRate()">getCrossoverRate</a></strong>()</code>
<div class="block">Returns the crossover rate.</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/GeneticAlgorithm.html#getGenerationsEvolved()">getGenerationsEvolved</a></strong>()</code>
<div class="block">Returns the number of generations evolved to reach <a href="../../../../../org/apache/commons/math3/genetics/StoppingCondition.html" title="interface in org.apache.commons.math3.genetics"><code>StoppingCondition</code></a> in the last run.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics">MutationPolicy</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getMutationPolicy()">getMutationPolicy</a></strong>()</code>
<div class="block">Returns the mutation policy.</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/GeneticAlgorithm.html#getMutationRate()">getMutationRate</a></strong>()</code>
<div class="block">Returns the mutation rate.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getRandomGenerator()">getRandomGenerator</a></strong>()</code>
<div class="block">Returns the (static) random generator.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/genetics/SelectionPolicy.html" title="interface in org.apache.commons.math3.genetics">SelectionPolicy</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getSelectionPolicy()">getSelectionPolicy</a></strong>()</code>
<div class="block">Returns the selection policy.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#nextGeneration(org.apache.commons.math3.genetics.Population)">nextGeneration</a></strong>(<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;current)</code>
<div class="block">Evolve the given population into the next generation.</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/genetics/GeneticAlgorithm.html#setRandomGenerator(org.apache.commons.math3.random.RandomGenerator)">setRandomGenerator</a></strong>(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a>&nbsp;random)</code>
<div class="block">Set the (static) random generator.</div>
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<a name="GeneticAlgorithm(org.apache.commons.math3.genetics.CrossoverPolicy, double, org.apache.commons.math3.genetics.MutationPolicy, double, org.apache.commons.math3.genetics.SelectionPolicy)">
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<h4>GeneticAlgorithm</h4>
<pre>public&nbsp;GeneticAlgorithm(<a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a>&nbsp;crossoverPolicy,
double&nbsp;crossoverRate,
<a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics">MutationPolicy</a>&nbsp;mutationPolicy,
double&nbsp;mutationRate,
<a href="../../../../../org/apache/commons/math3/genetics/SelectionPolicy.html" title="interface in org.apache.commons.math3.genetics">SelectionPolicy</a>&nbsp;selectionPolicy)
throws <a href="../../../../../org/apache/commons/math3/exception/OutOfRangeException.html" title="class in org.apache.commons.math3.exception">OutOfRangeException</a></pre>
<div class="block">Create a new genetic algorithm.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>crossoverPolicy</code> - The <a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>CrossoverPolicy</code></a></dd><dd><code>crossoverRate</code> - The crossover rate as a percentage (0-1 inclusive)</dd><dd><code>mutationPolicy</code> - The <a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>MutationPolicy</code></a></dd><dd><code>mutationRate</code> - The mutation rate as a percentage (0-1 inclusive)</dd><dd><code>selectionPolicy</code> - The <a href="../../../../../org/apache/commons/math3/genetics/SelectionPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>SelectionPolicy</code></a></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 crossover or mutation rate is outside the [0, 1] range</dd></dl>
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<h4>setRandomGenerator</h4>
<pre>public static&nbsp;void&nbsp;setRandomGenerator(<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a>&nbsp;random)</pre>
<div class="block">Set the (static) random generator.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>random</code> - random generator</dd></dl>
</li>
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<a name="getRandomGenerator()">
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<h4>getRandomGenerator</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/commons/math3/random/RandomGenerator.html" title="interface in org.apache.commons.math3.random">RandomGenerator</a>&nbsp;getRandomGenerator()</pre>
<div class="block">Returns the (static) random generator.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the static random generator shared by GA implementation classes</dd></dl>
</li>
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<h4>evolve</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;evolve(<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;initial,
<a href="../../../../../org/apache/commons/math3/genetics/StoppingCondition.html" title="interface in org.apache.commons.math3.genetics">StoppingCondition</a>&nbsp;condition)</pre>
<div class="block">Evolve the given population. Evolution stops when the stopping condition
is satisfied. Updates the <a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getGenerationsEvolved()"><code>generationsEvolved</code></a>
property with the number of generations evolved before the StoppingCondition
is satisfied.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>initial</code> - the initial, seed population.</dd><dd><code>condition</code> - the stopping condition used to stop evolution.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the population that satisfies the stopping condition.</dd></dl>
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<a name="nextGeneration(org.apache.commons.math3.genetics.Population)">
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<h4>nextGeneration</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;nextGeneration(<a href="../../../../../org/apache/commons/math3/genetics/Population.html" title="interface in org.apache.commons.math3.genetics">Population</a>&nbsp;current)</pre>
<div class="block">Evolve the given population into the next generation.
<p>
<ol>
<li>Get nextGeneration population to fill from <code>current</code>
generation, using its nextGeneration method</li>
<li>Loop until new generation is filled:</li>
<ul><li>Apply configured SelectionPolicy to select a pair of parents
from <code>current</code></li>
<li>With probability = <a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getCrossoverRate()"><code>getCrossoverRate()</code></a>, apply
configured <a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>CrossoverPolicy</code></a> to parents</li>
<li>With probability = <a href="../../../../../org/apache/commons/math3/genetics/GeneticAlgorithm.html#getMutationRate()"><code>getMutationRate()</code></a>, apply
configured <a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics"><code>MutationPolicy</code></a> to each of the offspring</li>
<li>Add offspring individually to nextGeneration,
space permitting</li>
</ul>
<li>Return nextGeneration</li>
</ol></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>current</code> - the current population.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the population for the next generation.</dd></dl>
</li>
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<a name="getCrossoverPolicy()">
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<h4>getCrossoverPolicy</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/genetics/CrossoverPolicy.html" title="interface in org.apache.commons.math3.genetics">CrossoverPolicy</a>&nbsp;getCrossoverPolicy()</pre>
<div class="block">Returns the crossover policy.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>crossover policy</dd></dl>
</li>
</ul>
<a name="getCrossoverRate()">
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<h4>getCrossoverRate</h4>
<pre>public&nbsp;double&nbsp;getCrossoverRate()</pre>
<div class="block">Returns the crossover rate.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>crossover rate</dd></dl>
</li>
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<a name="getMutationPolicy()">
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<h4>getMutationPolicy</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/genetics/MutationPolicy.html" title="interface in org.apache.commons.math3.genetics">MutationPolicy</a>&nbsp;getMutationPolicy()</pre>
<div class="block">Returns the mutation policy.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>mutation policy</dd></dl>
</li>
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<h4>getMutationRate</h4>
<pre>public&nbsp;double&nbsp;getMutationRate()</pre>
<div class="block">Returns the mutation rate.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>mutation rate</dd></dl>
</li>
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<h4>getSelectionPolicy</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/commons/math3/genetics/SelectionPolicy.html" title="interface in org.apache.commons.math3.genetics">SelectionPolicy</a>&nbsp;getSelectionPolicy()</pre>
<div class="block">Returns the selection policy.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>selection policy</dd></dl>
</li>
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<a name="getGenerationsEvolved()">
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<h4>getGenerationsEvolved</h4>
<pre>public&nbsp;int&nbsp;getGenerationsEvolved()</pre>
<div class="block">Returns the number of generations evolved to reach <a href="../../../../../org/apache/commons/math3/genetics/StoppingCondition.html" title="interface in org.apache.commons.math3.genetics"><code>StoppingCondition</code></a> in the last run.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>number of generations evolved</dd><dt><span class="strong">Since:</span></dt>
<dd>2.1</dd></dl>
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