> On 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 >
Try this (calculate distances with `outer` and then sweep the columns with `apply`) > dqt <- outer(x, quantile(x), function(x,y) sqrt( (x-y)^2) ) > apply(dqt, 2, which.min) 0% 25% 50% 75% 100% 3 4 7 1 8 -- David. > 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. David Winsemius Alameda, CA, USA ______________________________________________ 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.
