Paul Hiemstra wrote: > Zeljko Vrba wrote: >> Given an arbitrary data frame, it is easy to exclude a column given >> its index: >> df[,-2]. How to do the same thing given the column name? A naive >> attempt >> df[,-"name"] did not work :) >> >> ______________________________________________ >> 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. >> > Hi, > > This piece of code does the trick. Most important is the which() command: > > df = data.frame(a = runif(10), b = runif(10)) > df[,-which(names(df) == "a")] >
You don't actually need which() (and the approach runs into problems if "a" isn't there). Just select the others: df[, names(df) != "a"] Or, BTW, you can use within() aq <- within(airquality, rm(Day)) -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907 ______________________________________________ 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.
