He everybody, I want to add 1 to some elements of a vector:
x is a vector u is a vector of idices, that is, integers assumed to be within the range 1..length(x) and I want to add 1 to the elements of x each time their index appears in u x[u]<-x[u]+1 works only when there are no duplicated values in u I found this solution: tu <- table(u) indices <- as.numeric(names(tu)) x[indices] <- x[indices]+tu but it looks ugly to me and I would prefer to avoid calling the function 'table' since this is to be done millions of times as part of a simulation program. Eric Elguero Génétique & Adaptation des Plasmodium IRD Montpellier - FRance ______________________________________________ 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.
