On 01-12-2012, at 13:37, CE.KA wrote: > Hi R users > > Imagine the table "base": > p=c("d","d","b","b","a","a") > q=c("v1","v2","v1","v2","v1","v2") > r=c(5,2,4,8,9,7) > base=data.frame(p,q,r) > base > > p q r > 1 d v1 5 > 2 d v2 2 > 3 b v1 4 > 4 b v2 8 > 5 a v1 9 > 6 a v2 7 > > How programming R to get this result: > > v1 v2 > a 9 7 > b 4 8 > d 5 2 >
xtabs(r~p+q,data=base) Output --------- q p v1 v2 a 9 7 b 4 8 d 5 2 Berend ______________________________________________ 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.