1. use strict may reveal a nunmber of errors.
  2. use Data::Dumper; and print Dumper $oBook; just before the for loop, will show what $oBook contains.
  3. Manually debug with Perl -d. You can determine what is there, what can be done, and why.

--
TTTATCGGTCGTTATATAGATGTTTGCA

In reply to Re: Perl module problem by TomDLux
in thread Perl module problem by Anonymous Monk

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