if ($matrix[$i][$j] =~ /[^0.00]/){

This does not do what you think it does, but it is at least close. You are really only doing if ($matrix[$i][$j] =~ /[^0.]/){ IE: does the string have at least one character that is not a literal '0' or a '.'

See: Bracketed Character Classes

Why not make the test if ($matrix[$i][$j] > 0)? That's much simpler and faster, and will not fail on "-0.00 " or " 0.00" or regular negative numbers.

In reply to Re^3: Calculate log of matrix values by SuicideJunkie
in thread Calculate log of matrix values by madM

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