HI it's me again Being a beginner with perl at best, I have another question for you, after my problem with the pairwise comparisons I have a hash which holds a key with two letters, and then a numerical value. How can I access these values in order to perform calculations on them. I need to log them and then add them. I have written a small subroutine, that calculates the log with base 2 so I first need to use that (call it log_2) , to each numerical value in my hash and then add these values. Once again thanks in advance for anyone's help

In reply to Accessing and performing calculations with elements of a hash by replicant4

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