Dear R Users! I'm new in R! I've got a data.frame. For
example:a<-data.frame(cbind( 0:1, 1:10)) X1 X2
1 0 1
2 1 2
3 0 3
4 1 4
5 0 5
6 1 6
7 0 7
8 1 8
9 0 9
10 1 10 Firstly i want to create combinations from X2, for
example:combn(a$X2,2) It's ok, butsecondly I would like to get combinations
from those X2 numbers only , where X1= 0. Could you help me? Thanks!
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