Hi QM, Your code has bee very helpful. Afters days of searching I now finally found this post/site and has given me faith I can do what I need (only a Perl beginner/hacker) Wondering if you could please help me do somthing like this.. which counts and is additive on multiple line items. 
id1    id2    int
208    10000    1
208    10000    7
207    10000    3
8517   1147    1
3551   1147    2

   id1\id2      1147     10000
       207         0         3
       208         0         8
      3551         1         0
      8517         1         2

[download]
I will be forever in your gratitude!

In reply to Re^3: how to convert two lists into adjacency matrix by jaybode
in thread how to convert two lists into adjacency matrix by koleti

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