[R] Create pairwise table from columns?

From: knussear <knussear_at_mac.com>
Date: Fri, 09 May 2008 17:17:44 -0700 (PDT)

Hi Group

I have a large data set of individual pairwise values (250,000 rows) that I need to reshape into a pairwise matrix for mantel tests of these values versus genetic distances.

the data are currently in columns formatted like so AnimalA, AnimalB, Score

A1, A2, S1
A1, A3, S2
A1, A4, S3
A2, A3, S4
A2, A4, S5
A3, A4, S6


I need the final matrix to be formatted as

     A1    A2    A3    A4
A1  0     S1    S2    S3
A2  S1    0     S4    S5
A3  S2    S4   0      S6
A4  S3    S4   S6     0

are there any functions/packages that will make this easier?



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