In a perl array of arrays, just like in C, the data structure does not have to be rectangular (or cuboidal, or ...). For example, you can have an array like so: 
@foo = (
    [0, 1, 2, 3, 4, 5],
    [0, 1, 2],
    [0, [ 0, 1, 2, 3 ]]
);

[download]
There, @foo contains three references to arrays, all of which are of different lengths. One of them contains a reference to another array as well as an ordinary scalar. The following code will tell you the largest number of elements in each dimension. Dimensions are numbered starting at zero (I assume $[ has not been altered): 
my @foo = (
    [0, 1, 2, 3, 4, 5],
    [0, 1, 2],
    [0, [ 0, 1, 2, 3 ]]
);

my @maxlength = ();
figger_out_depth(0, @foo);

print "max dimensions:\n";
print "  $_: $maxlength[$_]\n" foreach (0..$#maxlength);

sub figger_out_depth {
    my $depth = shift;
    $maxlength[$depth] = 0 unless(defined($maxlength[$depth]));
    foreach my $element (@_) {
        figger_out_depth($depth + 1, @{$element}) if(ref($element) eq 
+'ARRAY');
    }
    $maxlength[$depth] = $#_ + 1 if($#_ >= '0'.$maxlength[$depth]);
}

[download]

In reply to Re: How cand I find each dimension x,y,z of a 3D arrays by DrHyde
in thread How cand I find each dimension x,y,z of a 3D arrays by Arnaud

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.