I recommend the Fisher-Yates Shuffle. See my node on the topic. 
# The Fisher-Yates Shuffle 
sub Shuffle
{
    my $arrayref = shift;
    my $index = @$arrayref;
    while ( $index-- ) 
    {
        my $newloc = int rand (1+$i);
        # next if $index == $newloc; # Not needed in Perl.
        @$arrayref[$index, $newloc] = @$arrayref[$newloc, $index];
    }
}

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The line I commented out is part of the Fisher-Yates Shuffle, but its a waste of time in Perl, since the swap is done correctly. (If it were an XOR swap then you would want the next in there)

In reply to RE: Randomize an array by Adam
in thread Randomize an array by Zebu

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