I believe part of the problem is that you only want to iterate through each distinct item once within that outer for loop. There are only three distinct items: TAGT, TTTT, and TTAT, yet the loop will iterate 5 times thus giving you incorrect results. Something like next if exists $transaction_map_ref->{$item}; inserted just before the second for loop ought to solve that problem.

Secondly, $$transaction_map_ref{$item}{$tid}++; increments the transaction id of the outer loop item as opposed to the inner loop item, which is what we care about. That needs to be changed to $transaction_map_ref->{$item}{$tid2}++; instead.

Lastly, ditch last.

Also, I just happened to be reading about using the variable names $a and $b before I read this post. You ought to rename those variables within your hd routine, just for good measure. (see (re:x5 use strict....)$a and $b should be in perlvar)

In reply to Re: Element Count from Array to HoH by djohnston
in thread Element Count from Array to HoH by monkfan

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.