NAME

  Algorithm::Evolutionary::Op::ChangeLengthMutation - Increases/decreases by one the length of the string


SYNOPSIS

  my $xmlStr2=<<EOC;
  <op name='ChangeLengthMutation' type='unary' rate='0.5' />
  EOC
  my $ref2 = XMLin($xmlStr2);
  my $op2 = Algorithm::Evolutionary::Op::Base->fromXML( $ref2 );
  print $op2->asXML(), "\n*Arity ", $op->arity(), "\n";
  my $op = new Algorithm::Evolutionary::Op::ChangeLengthMutation 1, 0.5, 0.5; #Create from scratch


Base Class

Algorithm::Evolutionary::Op::Base


DESCRIPTION

Increases or decreases the length of a string, by adding a random element, or eliminating it.


METHODS

new

Creates a new operator. It is called with 3 arguments: the rate it's going to be applied, and the probability of adding and substracting an element from the string each time it's applied. Rates default to one.

create

Creates a new operator. It is called with 3 arguments: the rate it's going to be applied, and the probability of adding and substracting an element from the string each time it's applied. Rates default to one.

apply

This is the function that does the stuff. The probability of adding and subsctracting are normalized. Depending on a random draw, a random char is added to the string (at the end) or eliminated from a random position within the string.


Copyright


  This file is released under the GPL. See the LICENSE file included in this distribution,
  or go to http://www.fsf.org/licenses/gpl.txt
  CVS Info: $Date: 2002/06/20 15:41:35 $ 
  $Header: /cvsroot/opeal/opeal/Algorithm/Evolutionary/Op/ChangeLengthMutation.pm,v 1.3 2002/06/20 15:41:35 jmerelo Exp $ 
  $Author: jmerelo $ 
  $Revision: 1.3 $
  $Name $