Hi, On Thu, Apr 22, 2010 at 11:21 AM, Muhammad Rahiz <muhammad.ra...@ouce.ox.ac.uk> wrote: > Hi all, > > I would like to get the array index for a range of values, say 0 < x < 1.5. > I'm wondering if there is an alternative for the following which I've done > > x0 <- rnorm(100) > x1 <- ifelse(x0 > 0 & x0 < 1.5,"t","f") > x2 <- which(x1=="t",arr.ind=TRUE) > x0[x2]
Two things: 1. Not that it really matters, but why are you using arr.ind=TRUE when x0 is just a "normal" vector? 2. Just skip the middle-man creation of x1: R> x0 <- rnorm(100) R> x2 <- which(x0 > 0 & x0 < 1.5) R> x0[x2] Why not just skip the middle man (x1)? -- Steve Lianoglou Graduate Student: Computational Systems Biology | Memorial Sloan-Kettering Cancer Center | Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact ______________________________________________ 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.
