There's the code from the Perl Cookbook:
**UPDATE: here is a node that already mentions it (and the weight_to_dist sub that I didn't put here).
###########################
#from Perl Cookbook 2.10
#take in a hash and via a weighted random, pick one of the
#keys based on the value and return it
###########################
sub weighted_rand {
my %dist = @_;
my ($key, $weight);
my $rand;
while (1) { # to avoid floating point inaccuracies
$rand = rand;
while ( ($key, $weight) = each %dist ) {
return $key if ($rand -= $weight) < 0;
}
}
}
###########################
------------------------------------
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