Hi, Try this: dat1<-read.table(text=" 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 ",sep="",header=FALSE) dat2<-dat1[,-1] combn((subset(dat2,V2==0))$V3,2) [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 1 1 1 1 3 3 3 5 5 7 [2,] 3 5 7 9 5 7 9 7 9 9
A.K. ----- Original Message ----- From: Dikán Szabolcs András <dikanszabo...@freemail.hu> To: R-help@r-project.org Cc: Sent: Sunday, August 19, 2012 8:14 PM Subject: [R] (no subject) Dear R Users! I'm new in R! I've got a data.frame. For example:a<-data.frame(cbind( 0:1, 1:10)) X1 X2 1 0 1 2 1 2 3 0 3 4 1 4 5 0 5 6 1 6 7 0 7 8 1 8 9 0 9 10 1 10 Firstly i want to create combinations from X2, for example:combn(a$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]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
