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Initial version of the tutorial.

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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Mozilla/4.72 [en] (X11; U; Linux 2.2.16 i686) [Netscape]">
<title>Variation Operators</title>
</head>
<body>
<h1>
<b><font color="#000099">Variation Operators</font></b></h1>
Variation operators modify individuals, or, equivalently, move them in
the search space. They are almost always <font color="#FF0000">stochastic</font>,
i.e. they generate random variations. Variation operators are classified
depending on the number of arguments they use and/or modify.
<p>Variation operators involving two individuals are called
<a href="##crossover">crossover operators</a>.
They can either modify one of the parents according
to the material of the other parent, or modify both parents. In EO, the
former are called Binary operators and the latter Quadratic operators.
<br>&nbsp;
<p>Variation operators involving one single individual are called <a href="##mutation">mutation
operators.</a>
<p>Note that in EO you can define and use variatio operators that generate
any number of offspring fromany number of parents. These are called general
operators, and require advanced knowledge of EO.
<p><a NAME="#crossover"></a><b><font color="#000099"><font size=+2>Crossover</font></font></b>
<br>Crossover operators involve two parents, and can modify one of them,
or both of them.
<p>Using crossover operators
<p><a NAME="#mutation"></a><b><font color="#000099"><font size=+2>Mutation</font></font></b>
<br>Mutation operators modify one single individual. The corresponding
EO class is called eoMonOp.
<h2>
<font color="#009900"><font size=+1>Using mutation operators</font></font></h2>
The standard EO genotypes (bistrings and real vectors) have pre-defined
mutation operators.
<br>&nbsp;
<h2>
<font color="#009900"><font size=+1>Writing a mutation operator</font></font></h2>
&nbsp;
<p>&nbsp;
<p><a NAME="general"></a><b><font color="#000099"><font size=+2>General
Operators</font></font></b>
<br><b><font color="#000099"><font size=+2></font></font></b>&nbsp;
<br><b><font color="#000099"><font size=+2></font></font></b>&nbsp;
<br>&nbsp;
<p>
<hr>
<address>
<a href="mailto:marc@cmapx.polytechnique.fr">Marc Schoenauer</a></address>
<br><!-- Created: Mon Oct 30 18:16:54 CET 2000 --><!-- hhmts start -->Last
modified: Mon Oct 30 18:24:39 CET 2000<!-- hhmts end -->
</body>
</html>