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! [[alternative HTML version deleted]]
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