I have tried ifelse: > trade<-data.frame(avgflow,EMU,stringsAsFactors=FALSE)
> avgflowEURO<-rep(0,nrow(trade)) > trade1<-(for (i in > 1:nrow(trade)){ifelse(EMU[i]==1,avgflowEURO[i]<-avgflow[i],NA)}) -- View this message in context: http://r.789695.n4.nabble.com/Assignment-problems-tp4578672p4578754.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.