I have the following data from a file, list.txt, where each element in the list has a non-numerical value associated with it, like so:

     A X
     B Y
     C Z
     D X
     E X

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I want to create a matrix where if any pair of elements have the value X (XX, XY, XZ) the code assigns 0 to that spot in the matrix, or otherwise it assigns 2 to it.

I realize I need to set arrays first, so I started with this (NB: code is incomplete, so don't expect it to run):


use strict;
use warnings;

open(IN, "list.txt") or die;
chomp($line = <IN>);
($a, @ss) = split /\s+/, $line;
while (chomp($line = <IN>)) {
    ($aa, @prs) = split /\s+/, $line;
    for ($i=0; $i<@prs; $i++) {
$s{$aa}{$ss[$i]} = $prs[$i];
    }
}
close(IN);

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But I would appreciate any input on 1) code correctness, and 2)assigning numerical values to non-numerical pairs.

The expected output is a matrix with 0s and 2s, like so

      A  B  C  D

    A 0  0  0  0
    B 0  2  2  0
    C 0  2  2  0

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In reply to matrices and non-numerical values by thschhk

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