Also, your loop comparison should be $i <= $#array1 or $i < @array1, not $i <= $array1, which tries to compare $i to some (probably newly created) scalar $array1.

Strong Suggestion: always use warnings; and use strict;, which would have alerted you to some, at least, of the errors noted.

Another Suggestion: try using the Perl-style rather than the C-style for loop: 

for my $i (@array1) {
    for my $j (@array2) {
        ...
        }
    }

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In reply to Re: finding all combinations by Anonymous Monk
in thread finding all combinations by Anonymous Monk

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