My most revered monks,
The subroutine below compute the number of mismatches between two strings (they are always equal) - usually called Hamming Distance.
However my code below is painfully slow. I am terribly in need of a super fast way to do this. In particular it has to process millions of string pairs.
Thus I turn to you my brother monks, for illumination in this matter.
my $s1 = 'AAAAA';
my $s2 = 'ATCAA';
my $s3 = 'AAAAA';
hd($s1,s2) # will give value 2
hd($s1,s3) # will give value 0
#String length is assumed to be equal
my ($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);
: Benchmark. Thanks so much everybody.
Rate Mine RJ BWK inman
Mine 176987/s -- -65% -78% -80%
RJ 504123/s 185% -- -38% -44%
BWK 817943/s 362% 62% -- -9%
inman 901871/s 410% 79% 10% --
*Note: Mine has already included the modification
suggested by 'wazoox'.
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