Your code and logic is rather convoluted.

I offer: 

use strict;
use warnings;

my %element;
while (<DATA>){
  my ($elem, $value) = split;
  $element{$elem}= $value;
}
print "  ";
print "$_ " for sort keys %element;
print "\n";
for my $k1(sort keys %element){
  print "$k1 ";
  for my $k2(sort keys %element){
     my $val = $element{$k1} eq "X" ? 0
             :  $element{$k2} eq "X" ? 0
             : 2;
     print $val . " ";
  }
  print "\n";
}

__DATA__
  A X
     B Y
     C Z
     D X
     E X

[download]

             I hope life isn't a big joke, because I don't get it.
                   -SNL

In reply to Re^3: matrices and non-numerical values by NetWallah
in thread matrices and non-numerical values by thschhk

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