1. I do not think what the OP requested exists, at least as I understand her -- how would one define the "surfaces" where the piecewise multidimensional polynomials are "joined"? (only 1-d space is ordered)
2. But, as she has already been told, there are various ways of doing multivariate smoothing splines. The mars() function in packages mda and earth is another. Apparently the one in earth adds "extra features" to the one in mda. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Fri, Dec 18, 2015 at 10:52 AM, David Winsemius <dwinsem...@comcast.net> wrote: > >> On Dec 18, 2015, at 7:42 AM, <francesca.manc...@ubs.com> >> <francesca.manc...@ubs.com> wrote: >> >> Dear all, >> >> I am looking for a package which performs splining in more than one >> dimension with polynomials of order>1, exactly as the package "splines" does >> in 1D. >> For the moment I was only able to find the package "polspline", whose >> function "polymars" performs just piecewise linear splines, so not exactly >> what I'm looking for. >> Do you know of anything else? > > I have pleasing experience with the `rcs` function from package 'rms'. One > can build such multidimensional splines with the formula interface using the > "*" crossing-operator. It is limited to only piecewise cubic splines. You can > specify the knots or let them be optimized by the regression function. It's > effective use does require that you learn the requirements of the surrounding > helper functions and data description methods supplied by the rms/Hmisc > packages. > > > -- > David > >> > > 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. ______________________________________________ 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.
