Maybe something along the lines of: 

c:\@Work\Perl>perl -wMstrict -e
"my @strings = qw(DOG COT BAL MAN);
 ;;
 use constant FMT => '%6s';
 ;;
 printf FMT, $_ for '', @strings;
 print qq{\n};
 ;;
 for my $row (@strings) {
   printf FMT, $row;
   for my $col (@strings) {
     my $d = diff($row, $col);
     printf FMT, $d;
     }
   print qq{\n};
   }
 ;;
 sub diff { return scalar ($_[0] ^ $_[1]) =~ tr/\0//c; }
"
         DOG   COT   BAL   MAN
   DOG     0     2     3     3
   COT     2     0     3     3
   BAL     3     3     0     2
   MAN     3     3     2     0

[download]

Update: In the
    sub diff { return scalar ($_[0] ^ $_[1]) =~ tr/\0//c; }
function definition, the scalar call is not needed, but does no harm. (Assignment to a scalar imposes scalar context.)

Give a man a fish:  <%-{-{-{-<

In reply to Re: 10 x 10 table of values by AnomalousMonk
in thread table of values by dnamonk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.