$key4 = the amino acid position. It is derived from the first file and edited to remove non digits so that its just a numerical position

cell $key4 is originally initialized as 0 and at this step it needs to be changed to the number of mutations at this site (the array length corresponds to the gene length of gene $key1 so each cell corresponds to an amino acid position in the gene). It is set equal to scalar ( @{$site{$key1}{$key4}} ); because this calculates the number of values at a mutation site, thus the size of this essentially opperates as a count for recurrent positions across different samples. The numbers for this are mostly 0-10 there are a few large like one 35K and a few below that.

In reply to Re^2: Memory issue with large cancer gene data structure by ZWcarp
in thread Memory issue with large cancer gene data structure by ZWcarp

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.