Hi, folks, Finally Friday~~ Here comes the question:
x=c('germany','poor italy','usa','england','poor italy','japan') y=c('Spain','germany','usa','brazil','england','chile') s=1:6 z=3:8 test=data.frame(x,y,s,z) #Now I only concern the countries ('germany','england','brazil'). I would like to keep the rows where these three countries #are involved either in test$x OR test$y. So the result should be like as follows (I did this manually >< ): x y s z 1 germany Spain 1 3 2 poor italy germany 2 4 3 england Brazil 4 6 4 poor italy england 5 7 Any codes work for this? Thanks great in advance. [[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.