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use strict; |
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use warnings; |
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=head1 NAME |
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Algorithm::Evolutionary::Wheel - Random selector of things depending on probabilities |
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=head1 SYNOPSIS |
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my $wheel = new Algorithm::Evolutionary::Wheel( @probs ); |
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print $wheel->spin(); #Returns an element according to probabilities; |
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=head1 DESCRIPTION |
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Creates a "roulette wheel" for spinning and selecting stuff. It will |
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be used in several places; mainly in the |
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L. Take care that fitness |
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must be non-zero positives; since if they aren't, roulette wheel won't |
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work at all |
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=head1 METHODS |
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=cut |
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package Algorithm::Evolutionary::Wheel; |
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use Carp; |
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2279
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our ($VERSION) = ( '$Revision: 3.6 $ ' =~ / (\d+\.\d+)/ ) ; |
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=head2 new( @probabilites ) |
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Creates a new roulette wheel. Takes an array of numbers, which need not be |
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normalized |
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=cut |
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sub new { |
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my $class = shift; |
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my @probs = @_; |
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my $self; |
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$self->{'_accProbs'} = [ 0 ]; |
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my $acc = 0; |
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for ( @probs ) { $acc += $_;} |
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croak "The sum of fitness is 0, can't use roulette wheel\n" if ! $acc; |
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for ( @probs ) { $_ /= $acc;} #Normalizes array |
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#Now creates the accumulated array |
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my $aux = 0; |
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for ( @probs ) { |
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push @{$self->{'_accProbs'}}, $_ + $aux; |
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$aux += $_; |
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} |
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bless $self, $class; |
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return $self; |
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} |
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=head2 spin( [$number_of_individuals = 1]) |
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Returns an individual whose probability is related to its fitness |
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=cut |
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sub spin { |
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1
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my $self = shift; |
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my $number_of_individuals = shift || 1; |
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104
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my $i = 0; |
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my @rand; |
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for my $n ( 1..$number_of_individuals ) { |
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push @rand, rand(); |
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} |
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134
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my @individuals; |
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for ( my $r=0; $r<= $#rand; $r++ ) { |
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my $i = first( $rand[$r], $self->{'_accProbs'} ); |
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# my $i = -1; # First iteration must be 0 |
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# do { |
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# $i++; |
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# } until (( $acc_probs[$i+1] > $rand[$r] ) || ($i >= $#acc_probs )); |
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# $individuals[$r] = $i; |
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push @individuals, $i; |
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} |
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if ( $number_of_individuals > 1 ) { |
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return @individuals; |
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} else { |
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return $individuals[0]; |
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} |
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} |
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=head2 first( $item, $ref_to_list ) |
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Returns the index of the first individual smaller than the item |
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=cut |
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97
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sub first { |
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114
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1
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my $item = shift; |
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114
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33
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467
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my $list = shift || croak "No list"; |
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114
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my $first=0; |
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114
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my $last= scalar @$list -1; |
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my $mid=int($last/2); |
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while ($first <= $last ) { |
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342
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100
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if ( $item > $list->[$mid] ) { |
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$first = $mid + 1; |
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} else { |
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$last = $mid -1; |
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} |
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$mid = $first+ int(($last - $first )/2); |
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} |
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return $last; |
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113
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} |
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=head1 Copyright |
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This file is released under the GPL. See the LICENSE file included in this distribution, |
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or go to http://www.fsf.org/licenses/gpl.txt |
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119
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CVS Info: $Date: 2010/12/08 09:31:24 $ |
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$Header: /media/Backup/Repos/opeal/opeal/Algorithm-Evolutionary/lib/Algorithm/Evolutionary/Wheel.pm,v 3.6 2010/12/08 09:31:24 jmerelo Exp $ |
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$Author: jmerelo $ |
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123
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=cut |
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125
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"The truth is by here"; |
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127
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#Test code |
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#my @array = qw( 5 4 3 2 1 ); |
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#my $wheel = new Wheel @array; |
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#my @histo; |
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#for ( 0..100 ){ |
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# my $s = $wheel->spin(); |
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# print "$s\n"; |
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# $histo[$s]++; |
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#} |
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#for ( 0..(@histo - 1)){ |
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# print $_, " => $histo[$_] \n"; |
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#} |
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142
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#my @array2 = qw( 1 3 7 4 2 1 ); |
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#my $wheel2 = new Wheel @array2; |
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145
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#my @histo2; |
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#for ( 0..100 ){ |
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# my $s = $wheel2->spin(); |
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# print "$s\n"; |
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# $histo2[$s]++; |
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#} |
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#for ( 0..(@histo2 - 1)){ |
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# print $_, " => $histo2[$_] \n"; |
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#} |