In the while loop, these 2 statements: 
        $sum += $col5;
        push @numbers, $col5;

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$sum and @numbers need to be declared before the while loop that reads the file. Then after each file is read, statements: 
    while (my ($i, $num) = each @numbers) {
        push @{ $output[$i] }, $num/$sum;
    }

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You would need to declare @output before the foreach loop begins.

Then after all the files have been read and the info collected, you could print it out like: print OUT join(",", @$_), "\n" for @output;

In reply to Re: Appending new column data to CSV file? by Cristoforo
in thread Appending new column data to CSV file? by rnaeye

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