[R] For Loop help needed

From: Geeti Khan <geetanjoli27_at_yahoo.com>
Date: Thu, 03 Jun 2010 08:18:05 -0700 (PDT)

I have a dataset with three column like this x1 x2 Count
1 0 523
1 0 23
0 0 2
0 1 45
0 0 3
1 1 433

I need to create a loop so that when c(x1,x2)=c(1,1), I can add the corresponding Counts.When c(x1,x2)=c(1,0), can add the corresponding counts and so on. Can anyone help me????

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