> match(b, a) [1] 4 5 2 3 1 5 5 1 Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of David Epstein > Sent: Wednesday, October 19, 2011 2:39 PM > To: r-help@r-project.org > Subject: [R] replacing values in one vector with corresponding index from > another vector > > A quick question for the gurus... > > Given: > > a=c(58,73,100,40,70) > b=c(40,70,73,100,58,70,70,58) > > How can I replace the elements of "b" with the corresponding index > numbers from "a" that start at 1? All values in "a" are unique. So, I > end up with: > > b=c(4,5,2,3,1,5,5,1) > > I believe I need to use one of the "apply" functions in combination with > "which" but I cannot make it work. > > thank you, > -david > > ______________________________________________ > 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.