Start by finding out which var is undefined, then keep backtracking.

print STDERR ('$row[0]: ', defined($row[0])?1:0, "\n");
print STDERR ('$row[1]: ', defined($row[1])?1:0, "\n");
print STDERR ('$matrix[$ab]: ', defined($matrix[$ab])?1:0, "\n");
print STDERR ('$matrix[$ab][3]: ', defined($matrix[$ab][3])?1:0,"\n");
print STDERR ('$total_packages: ', defined($total_packages)?1:0,"\n");
push(@MASTER, $row[0].":".$row[1].":$matrix[$ab][3]:".$total_packages.
+"AI"); last SWITCH; }

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(row[0] should be $row[0])

In reply to Re: Confused about "unitialized value" warning by ikegami
in thread Confused about "unitialized value" warning by xspikx

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