Ok, thank you. Now I understand a lot more about using bitwise approaches to Perl. I also just noticed your post from a while ago regarding Hamming Distance: my $s1 = 'AAAAA'; my $s2 = 'ATCAA'; my $s3 = 'AAAAA'; print "$s1:$s2 hd:", hd( $s1, $s2 ); # will give value 2 print "$s1:$s3 hd:", hd( $s1, $s3 ); # will give value 0 sub hd{ length( $_ 0 ) - ( ( $_ 0 ^ $_ 1 ) =~ tr\0\0 ) } I just didnt understand the line above defining the subroutine. How do you know which part refers to which sequence ($s1 vs $s2 for example)? Thank you so much! I can't believe how helpful and patient you are.

In reply to Re^9: Comparing 2 different-sized strings by AdrianJ217
in thread Comparing 2 different-sized strings by AdrianJ217

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