in reply to Using grep in a scalar context

Works for me: 
perl -E '@dipept = qw/XX AA BB CC DDAAD AAAAAAA/; $FMat[0][0] = grep(/
+AA/, @dipept); say $FMat[0][0]'
3

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The documentation of grep clearly states:
In scalar context, returns the number of times the expression was true.
What input do you have? What output do you expect?
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Re^2: Using grep in a scalar context
by newbie1991 (Acolyte) on Feb 06, 2013 at 13:37 UTC
    My input is a string of amino acid bases, essentially it looks like MHDLKNDHASDRWT and I am counting pair occurrences throughout. MH HD DL LK KN ND are all accepted and should be counted.
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