Thanks For the quick response. To simplify my question I used an array as an example.

Can I use the same concept on a hash value? Let's say I want to perform the same operation on values of the hash and return the sorted keys with new data. For instance:

#!/usr/local/bin/perl
use strict;

        my %pvalues = ( 1=> 0.5453980,
                        2=> 0.4902384,
                        3=> 0.8167950,
                        4=> 0.2821822,
                        5=> 0.4693030,
                        6=> 0.6491767,
                        7=> 0.9802138,
                        8=> 0.1155778,
                        9=> 0.9585124,
                        10=> 0.4069490
                        );
[download]

They keys of course are unique but the values may not. I have done the following.

        my $numberPvalues = scalar keys %pvalues;
        my $numberPvaluesCounter = scalar keys %pvalues;
        my $numberPos = 0;
        
        # now loop through all p values and calculate FDR value
        # store FDR values in hash, key = pos, value is FDRq
        my @reversPvalues =();
        my %sortedTransfPvalues =();
        my @inversPvalue =();
        my @cumulminPvalue =();
        

 while ($numberPvaluesCounter >= 1 ){

             #Sort the original pvalue hash based on the values descen
+ding manner
             foreach my $posCurrentPvalue (sort {$pvalues{$b} <=> $pva
+lues{$a}} keys %pvalues)
                 {
                  #calculate the transformed pvalues based on its rank
+ in the sorted value in the hash
                  my $transformedPvalue = $pvalues{$posCurrentPvalue} 
+* $numberPvalues / $numberPvaluesCounter;
                        $numberPvaluesCounter--;
                        #new indcies
                        $numberPos++;
                        push (@inversPvalue, $transformedPvalue);
                         #$sortedTransfPvalues{$numberPos}{$posCurrent
+Pvalue} = $transformedPvalue;
                         #$sortedTransfPvalues{$posCurrentPvalue}{$num
+berPos} = $transformedPvalue;
                         print "$posCurrentPvalue\t$transformedPvalue\
+n";

                 }#end foreach and sorting values
        }#end while for count down
[download]

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