First, $a and $b are special variables, and you shouldn't ever name your variables with those names. Never ever.

Second, this line has a couple of problems: 

        for my $b ( 0 .. $#{$array_of_lists->{$b}} )

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You're using $b on the same line where it's declared with my, and you're using $array_of_lists as a hash reference, when you mean to use the %array_of_lists hash. I think what you mean is "$#{ $array_of_lists{$a} }" but again, rename $a and $b. Even at that, your %array_of_lists keys start at 1, so you really want this: 

        for my $b ( 1 .. scalar @{$array_of_lists{$a}} )

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There are other places you're misusing %array_of_lists, but I won't mention them all. This should get you on the right track.

You might also want to look at perlreftut, perlref, and References quick reference.

In reply to Re: working with hashes of arrays by kyle
in thread working with hashes of arrays by gman1983

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