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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>Population</title>
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<div class="subTitle">jcgp.backend.population</div>
<h2 title="Class Population" class="title">Class Population</h2>
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<li>java.lang.Object</li>
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<li>jcgp.backend.population.Population</li>
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<pre>public class <span class="typeNameLabel">Population</span>
extends java.lang.Object</pre>
<div class="block">This class primarily holds a collection of chromosomes. In addition,
it provides a few utility methods for manipulating and copying
chromosomes, useful for evolutionary strategies.
<br><br>
<code>copyChromosome()</code> is used to create copies of chromosomes,
though it is also possible to create a new instance of population
directly from a seed chromosome using the right constructor.
<br><br>
For convenience, a random chromosome can be retrieved using
<code>getRandomChromosome()</code>, which is guaranteed to use the
experiment's specified seed. If an entirely random population
is needed, <code>reinitialise()</code> should be used to randomise
all chromosomes without creating a new instance of <code>Population</code>.</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Eduardo Pedroni</dd>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#Population-jcgp.backend.population.Chromosome-jcgp.backend.resources.Resources-">Population</a></span>(<a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a> parent,
<a href="../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a> resources)</code>
<div class="block">Initialise a population of copies of the given chromosome.</div>
</td>
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<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#Population-jcgp.backend.resources.Resources-">Population</a></span>(<a href="../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a> resources)</code>
<div class="block">Initialise a random population according to the parameters specified
in the resources.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#copyChromosome-int-int-">copyChromosome</a></span>(int source,
int target)</code>
<div class="block">Copy a chromosome into a different position.</div>
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<td class="colFirst"><code><a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#get-int-">get</a></span>(int index)</code>
<div class="block">Returns the indexed chromosome.</div>
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<td class="colFirst"><code><a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#getRandomChromosome--">getRandomChromosome</a></span>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#reinitialise--">reinitialise</a></span>()</code>
<div class="block">Loop through all chromosomes and randomise all connections
and functions.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../jcgp/backend/population/Population.html#sort--">sort</a></span>()</code>
<div class="block">Sorts the population in ascending order of fitness quality.</div>
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<h4>Population</h4>
<pre>public Population(<a href="../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a> resources)</pre>
<div class="block">Initialise a random population according to the parameters specified
in the resources.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>resources</code> - the experiment's resources.</dd>
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<h4>Population</h4>
<pre>public Population(<a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a> parent,
<a href="../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a> resources)</pre>
<div class="block">Initialise a population of copies of the given chromosome.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>parent</code> - the chromosome to use as a model.</dd>
<dd><code>resources</code> - a reference to the experiment's resources.</dd>
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<h4>get</h4>
<pre>public <a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a> get(int index)</pre>
<div class="block">Returns the indexed chromosome.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>index</code> - the chromosome to return.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the indexed chromosome.</dd>
</dl>
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<h4>getRandomChromosome</h4>
<pre>public <a href="../../../jcgp/backend/population/Chromosome.html" title="class in jcgp.backend.population">Chromosome</a> getRandomChromosome()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a random chromosome from this population.</dd>
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<h4>copyChromosome</h4>
<pre>public void copyChromosome(int source,
int target)</pre>
<div class="block">Copy a chromosome into a different position.
After this returns, the target chromosome has
identical connections and functions to the source
one, though they are separate instances.
This method does nothing if source == target.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>source</code> - the chromosome to copy from.</dd>
<dd><code>target</code> - the chromosome to copy to.</dd>
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<h4>reinitialise</h4>
<pre>public void reinitialise()</pre>
<div class="block">Loop through all chromosomes and randomise all connections
and functions.</div>
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<h4>sort</h4>
<pre>public void sort()</pre>
<div class="block">Sorts the population in ascending order of fitness quality.
What this means is that the best fitness chromosome will be
in the last position, even though it might have the lowest
fitness value. Fitness orientation as specified in the resources
is respected.</div>
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