This code doesn't need to be so complicated - for instance why is there an and in there? If the values are always simple integers then the whole $z thing is just testing for equality with 0.

Given that, the loop is just aborting once a 0 values is hit. We also know that the length of the outer array in the result is the count of the first inner array in the matrix. Thus:

my @matrix=([qw(1 2 4 4)],[qw(5 2 0 8)],[qw(9 10 11 12)],);

my @t;
for my $i (0..$#{$matrix[0]}) {
  for my $j (0..$#matrix) {
    last if $matrix[$j][$i] == 0;
    $t[$i][$j] = $matrix[$j][$i];
  }
}

[download]
The result of both your code and mine is the same:

$VAR1 = [
          [ 1, 5, 9 ],
          [ 2, 2, 10 ],
          [ 4 ],
          [ 4, 8, 12 ],
        ]

[download]
Update: I must have missed Util's comment, which is virtually identical to mine :)

In reply to Re: Perl For loops by aufflick
in thread Perl For loops by d2caetano

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.