On Nov 15, 2007, at 9:15 AM, Thomas Frööjd wrote: > Hi > > I have three vectors say x, y, z. One of them, x contains observations > on a variable. To x I want to append all observations from y and > remove all from z. For appending c() is easily used > > x <- c(x,y) > > But how do I remove all observations in z from x? You can say I am > looking for the opposite of c().
If you are looking for the opposite of c, provided you want to remove the first part of things, then perhaps this would work: z<-c(x,y) z[-(1:length(x))] However, if you wanted to remove all appearances of elements of x from c(x,y), regardless of whether those elements appear in the x part of in the y part, I think you would want: z[!z %in% x] Probably there are other ways. Welcome to R! > Best regards Haris Skiadas Department of Mathematics and Computer Science Hanover College ______________________________________________ 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.
