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What if one of these conditions fails:
my ($ts,$cat) = $vals[0] =~ /TS(\d+)(.+)$/; ... for(0..$#cats) { if ($cats[$_] =~ /$cat/) { $j = $_ } } for(@{$groups[0]}) { if ($ts == $_) { $i = 0 } } for(@{$groups[1]}) { if ($ts == $_) { $i = 1 } } for(@{$groups[2]}) { if ($ts == $_) { $i = 2 } }
It looks like somehow, somewhere, either $i or $j is left undefined. Add some print statements in your loops that print out the values of your various variables and check that your assumptions are valid here. Could there be an empty line in your input?

In reply to Re: Use of uninitialized value in array element by Fastolfe
in thread Use of uninitialized value in array element by dimmesdale

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