First, read your data in a way that you get:

my @data = (
             [1,"info"],   
             [1,"info"],   
             [1,"info"],   
             [2,"info"],   
             [3,"info"],   
             [3,"info"],   
             [4,"info"],   
             [4,"info"],   
             [4,"info"],   
             [4,"info"],   
            );

[download]

Then make a hash keyed on both values (assuming the 'info' can have another value):

my %freq = ();
foreach my $datum (@data) {
    $freq{ sprintf("%d    %s", @$datum) }++;
}

[download]

Finally we print out the keys sorted by frequency. Setting $, to $/ puts a line break in after each element:

{
    local $,=$/;
    print sort { $freq{$b} <=> $freq{$a} } keys %freq;
}

[download]

This sort of frequency counting hash is a pretty common idiom.

After Compline,
Zaxo

In reply to Re: wisdom needed by Zaxo
in thread wisdom needed: sorting an array by Anonymous Monk

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.