I'd do it something like this:

  my @genes;  # I assume these come from somewhere

  for my $style (qw/ g2d pocus dgp /) {
    my($in, $out) = ($style . "_ranking", $style . "_rankratio");

    # step 1: locate and sort the relevant genes for this ranking styl
+e
    my @set = sort { $a->{$in} <=> $b->{$in} } grep $_->{$in}, @genes;

    # step 2: get a count
    my $total = @set;

    # step 3: update the located genes with a rankratio
    for my $index (0 .. $#set) {
      $set[$index]{$out} = ($index + 1) / $total;
    }
  }

[download]

Notes: I select the genes that have a particular ranking specified by checking $_->{$in} in a boolean context, so that it'll be false for zero or undef without warnings; I never store the intermediate re-based ranking as it is implicit in the order of @set; I only loop over the selected genes to update them, so I won't try to update an undef value, nor (since there would be zero loop iterations) will this try to divide by zero.

This code is untested.

Hugo

In reply to Re: converting list of rankings into list of rankratio's. by hv
in thread converting list of rankings into list of rankratio's. by BioGeek

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