Thank you John and ikegami. As I was afraid, it seems that I do still have difficulties with the basics of Perl (or rather of programming).

So the problem seems to have started when I first read the sequence line as $info{$gi}=$line;.

And then, @temp = $info{$humangi} operates as such $temp[0] = $info{$humangi}. I hope I get this right.

Thus, a possible solution is to store the sequence into an array in the beginning. To be frank, I do not know how to do this. Alternatively, there might be a way to convert a scalar value to an array list. (I would use split but as I see from your last comment on the use of split function, this is not a good way to do it.

Can you help me on this one?

In reply to Re^4: Use of uninitialized value in string eq by sophix
in thread Use of uninitialized value in string eq by sophix

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