perlquestion newbie1991 <p> Hello Monks! I'm trying to evaluate if a current array matches a preset pair and putting the number of occurrences of the pair in one element of the matrix. I've tried the following grep statement and it's not working. I think I know why (evaluating to true and false will not increment the counter each time, just replace it), but can someone help me out with what to do instead? </p> <code> $FMat[0][0]=grep(/AA/, @dipept); </code> <p> Essentially I want the [0][0] element to count how many times AA appears in my input sequence. I have already segmented it up into pairs (hence the @dipept, it only has 2 elements). As always, I'm just starting out and all help is appreciated. Thankyouu. :) PS : I'm a little shaky with hashes so if you suggest hashes please do expand on it a little. </p>