hey Laura, I hope this help f1 = c("a","b","c") f2 = c("b","a","c","d") match(f2,f1) f3 = match(f2,f1,0) ?match cbind(f2,f3) cbind(f2,f3>0) f4 = ifelse(f3>0,"yes","no") cbind(f2,f4) data.frame(f2,f4)
Patrizio 2009/2/25 Laura Rodriguez Murillo <laura.lmuri...@gmail.com>: > Hi dear list, > > If anybody could help me, it would be great! > > I have two files: > File 1 is a list (one column and around 100000 rows) > File 2 is a list with all the names from file one and a few more (one > column and more than 100000 rows) > > What I want is to add a column in file 2 that says which name appeared > in file 1 and which doesn't (yes and no would work as a code) > It's very important to keep the order of the names in file 2. > > Thank you! > > Laura > > ______________________________________________ > 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.