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Hello I'm confused with the benchmark by Edward. The XOR code seems to be 3 times faster than the 'mine' using the following benchmark (shouldn't benchmark code always be published?)
#!/usr/bin/perl -w use strict; my $s1 = 'AAAAA'; my $s2 = 'ATCAA'; for (my $i=0;$i<600000;$i++){ #choose one of the two methods #hd($s1,$s2); # real 0m1.401s hd2($s1,$s2); # real 0m0.405s } sub hd{ my ($k,$l) = @_; my $len = length ($k); my $num_mismatch = 0; for (my $i=0; $i<$len; $i++) { ++$num_mismatch if substr($k, $i, 1) ne substr($l, $i, 1); } return $num_mismatch; } sub hd2 { return ($_[0] ^ $_[1]) =~ tr/\001-\255//; }

In reply to Re^2: Hamming Distance Between 2 Strings - Fast(est) Way? by alpapan
in thread Hamming Distance Between 2 Strings - Fast(est) Way? by monkfan

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