Dear Dave,
Thanks for your response. I had read the master list into an array and then was reading each of the smaller lists into a separate array iteratively and was doing the comparison between the two arrays(master array and the smaller array). But I got stuck while creating/printing the matrix.

A question about your code: Do I have to read all my files into a single array called @raw_files ? These 7 files have a single column of gene ids(~5000 in number). How do I read all these files into a single array ? Though I could create one single file by "pasting" the individual files as separate columns. Thanks in advance for any help.

Regards,
Anupam

In reply to Re^2: Creating a binary matrix by perl_user123
in thread Creating a binary matrix by perl_user123

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