Thanks Sarah (and all the others who replied) for your precious suggestions! Matteo
On 22 November 2016 at 14:18, Sarah Goslee <sarah.gos...@gmail.com> wrote: > Here's how to get one: > > x <- c(9,9,1,3,2,7,6,10,5,6) >> which.min(abs(x - quantile(x, .25))) > [1] 4 > > And here's one of the various ways to get the entire set: > >> xq <- quantile(x) >> sapply(xq, function(y)which.min(abs(x - y))) > 0% 25% 50% 75% 100% > 3 4 7 1 8 > > Sarah > > On Tue, Nov 22, 2016 at 7:21 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 >> > -- > Sarah Goslee > http://www.functionaldiversity.org ______________________________________________ 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.
