Hi There is a print method for ecdf
So print(f) should give you an idea of what is going on See ?ecdf HTH Duncan Duncan Mackay Department of Agronomy and Soil Science University of New England Armidale NSW 2351 Email: home: mac...@northnet.com.au -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Manoranjan Muthusamy Sent: Friday, 1 November 2013 11:18 To: Rui Barradas Cc: r-help@r-project.org Subject: Re: [R] Extracting values from a ecdf (empirical cumulative distribution function) curve Thank you, Barradas. It works when finding y, but when I tried to find x using interpolation for a known y it gives 'NA' (for whatever y value). I couldn't find out the reason. Any help is really appreciated. Thanks, Mano On Thu, Oct 31, 2013 at 10:53 PM, Rui Barradas <ruipbarra...@sapo.pt> wrote: > Hello, > > As for the problem of finding y given the ecdf and x, it's very easy, > just use the ecdf: > > f <- ecdf(rnorm(100)) > > x <- rnorm(10) > y <- f(x) > > If you want to get the x corresponding to given y, use linear > interpolation. > > inv_ecdf <- function(f){ > x <- environment(f)$x > y <- environment(f)$y > approxfun(y, x) > } > > g <- inv_ecdf(f) > g(0.5) > > > Hope this helps, > > Rui Barradas > > Em 31-10-2013 12:25, Manoranjan Muthusamy escreveu: > >> Hi R users, >> >> I am a new user, still learning basics of R. Is there anyway to >> extract y (or x) value for a known x (or y) value from ecdf >> (empirical cumulative distribution function) curve? >> >> Thanks in advance. >> Mano. >> >> [[alternative HTML version deleted]] >> >> ______________________________**________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/m >> ailman/listinfo/r-help> PLEASE do read the posting guide >> http://www.R-project.org/** posting-guide.html >> <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 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. ______________________________________________ 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.
