Gunther Höning a écrit : > Hello, > > I calculate splines from messured points(x,y) of an unknown function f(x). > e.g. > x <- c(0.004115, 0.012345, 0.037037, 0.111110, 0.333330, 1.000000) > y <- c(37, 50, 45, 60, 50, 66) > w <- c(0.8540541, 0.8320000, 0.8822222, 0.7983333, 0.8220000, 0.8151515) as > weights > f <- smooth.spline(x,y,w) > > Now I have y-values and want to calculate the x-value(s) from this spline. > There is no further limitation to the spline, like monotonicity or anything > else.. > > Does anyone know how to do this ?
Perhaps this ? finv = splinefun(f$y,f$x) > > Gunther > > > > [EMAIL PROTECTED] > > ______________________________________________ > [email protected] 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. > > > -- =============================================== Cuvelier Etienne Assistant FUNDP - Institut d'Informatique rue Grandgagnage, 21 B-5000 Namur (Belgique) tel: 32.81.72.49.93 fax: 32.81.72.49.67 =============================================== -- ______________________________________________ [email protected] 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.
