One of the techniques to subset, a vector for instance, is the following: V <- c(18, 8, 5, 41, 8, 7) V ## [1] 18 8 5 41 8 7 ( I <- abs(V - 9) <= 3 ) ## [1] FALSE TRUE FALSE FALSE TRUE TRUE V[I] ## [1] 8 8 7
However, sometimes we are interested in the indexes of the elements where the condition holds. Is there an easy way to transform the I vector into an indexes vector similar to: I == c(2,5,6) ? I know that I can traverse the I vector with a for() loop collecting the indexes, I just wonder if such an operation can be avoided. Thanks, -Sergio. ______________________________________________ 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.
