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When I run the following code:
#!/usr/bin/perl use strict; use warnings; use AI::Genetic; use Data::Dumper; $|=1; my $ga = AI::Genetic->new ( -fitness => \&my_fitness, -type => 'rangevector' ); $ga->init([ [0,10], [0,10], [0,10], [0,10] ]); $ga->sortIndividuals($ga->people()); # Note that using this instead of sortPopulation does NOT # cause the same warnings: # my @populace = sort {$a->score <=> $b->score} @{$ga->people()}; sub my_fitness { my $genes = shift; print ref $genes, "\n"; my @sorted = sort { print Dumper($a,$b); sleep 1; $genes->[$a] <=> $genes->[$b] } 0..3; my $score = $sorted[1] + 2*$sorted[2] + 3*$sorted[3]; print "DEBUG: score was $score\n"; return $score; }
I get
1037% perl genetic.pl ARRAY $VAR1 = 0; $VAR2 = 1; $VAR1 = 2; $VAR2 = 3; $VAR1 = 1; $VAR2 = 2; $VAR1 = 1; $VAR2 = 3; $VAR1 = 0; $VAR2 = 3; DEBUG: score was 7 ARRAY $VAR1 = undef; $VAR2 = undef; Use of uninitialized value in array element at genetic.pl line 27. Use of uninitialized value in array element at genetic.pl line 27. $VAR1 = undef; $VAR2 = undef; Use of uninitialized value in array element at genetic.pl line 27. Use of uninitialized value in array element at genetic.pl line 27. $VAR1 = undef; $VAR2 = undef; Use of uninitialized value in array element at genetic.pl line 27. Use of uninitialized value in array element at genetic.pl line 27. $VAR1 = undef; $VAR2 = undef; Use of uninitialized value in array element at genetic.pl line 27. Use of uninitialized value in array element at genetic.pl line 27. DEBUG: score was 14 etc...
So the first sort seems to work fine, but it crashes on subsequent iterations. A mystery...

Update: It is an official bug: check out nested sort in perl-5.7.0 fails.

-Mark


In reply to Re: AI::Genetic gives me strange warnings by kvale
in thread AI::Genetic gives me strange warnings by fizbin

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