You might try something like x <- c(9,9,1,3,2,7,6,10,5,6) p <- (0:4)/4 order(x) [ quantile(seq_along(x),p, type=1) ] # [1] 3 4 7 1 8 Selecting which value of 'type' works makes my head hurt. You could also use 1+(p*(length(x)-1) as the index into order(x).
Bill Dunlap TIBCO Software wdunlap tibco.com On Tue, Nov 22, 2016 at 4:21 AM, Matteo Richiardi < matteo.richia...@gmail.com> wrote: > Dear R-users, > a very easy one for you, I guess. I need to extract the indexes of the > elements corresponding to different quantiles of a vector. When a > quantile is an interpolation between two adjacent values, I need the > index of the value which is closer (the lower value - or the higher > value for what matters - in case the quantile is exactly half way > through). > > This is an example. > > > x <- c(9,9,1,3,2,7,6,10,5,6) > > quantile(x) > 0% 25% 50% 75% 100% > 1.0 3.5 6.0 8.5 10.0 > > What I need is a vector 'index' which looks like > > > index > 3 4 7 1 8 > > Many thanks for your help ! Matteo > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
