All:
I am wondering what general approach you would use to solve the following problem:
  • You have a loop of some sort
  • In the body of the loop, an array is built by doing a lot of calculations
  • For the purpose of making a uniform column output - you push the value to an array or use 0 for a placeholder
  • At the end of the loop, you would like to print out totals for each column

    For instance: 

    #!/usr/bin/perl -w
use strict;
$\ = "\n";

foreach my $row ( 1 .. 10 ) {
    my @output;
    foreach my $column ( 1 .. 10 ) {
        push @output , $column;
    }
    print join ',' , @output;
}
# print column totals here

    [download]
    Now this is pretty easy to do by just looking at it, there will be exactly 10 rows and 10 columns. Each column will be the same number so the total will be 10, 20, 30, etc.

    My question is how would you do this if the number of columns was fixed, but the number of rows might vary depending on your data. Furthermore - the code to populate the the @output array is complicated and isn't as easy to determine as the simple foreach loop in my example. I was thinking of an AoA, but I can't get my head wrapped around how to process it afterwards.

    Any thoughts?

    Thanks in advance - L~R

    In reply to Multi-Column Totals by Limbic~Region

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