I believe you could easily use grep in your subroutine, as in: 

sub remove_poly
{
    my ($array,$lim) = @_;

    my $len = length $array->[0];
    my @sel_array = grep {
       my $a_count = $_ =~ tr/A//;
       my $t_count = $_ =~ tr/T//;
       my $c_count = $_ =~ tr/C//;
       my $g_count = $_ =~ tr/G//;

       my $a_portion = $a_count/$len;
       my $t_portion = $t_count/$len;
       my $c_portion = $c_count/$len;
       my $g_portion = $g_count/$len;

       $_ if ( $a_portion < $lim && $t_portion < $lim && $c_portion < 
+$lim && $g_portion < $lim )
    } @$array;
    return @sel_array;
}

[download]

The initial array being big, you could also return a reference to the resulting set, instead of the whole array.

In reply to Re: Removing Poly-ATCG from and Array of Strings by Fang
in thread Removing Poly-ATCG from and Array of Strings 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.