Or even mars() in the mda package... Andy
> From: Thomas W Blackwell [mailto:[EMAIL PROTECTED] > > Karim - > > try function gam() in package mgcv. > > library("mgcv") > help("gam") > > - tom blackwell - u michigan medical school - ann arbor - > > On Mon, 6 Oct 2003, Karim Elsawy wrote: > > > I would like to fit a function H = F(x,y,z) but I do not know the > > analytical expression of H, is there a way to get the best 3d > > polynomial (in x,y,z) which fits H > > e.g > > H<-seq(2,200,len=50) > > x<-seq(1,50,len=50) > > y<-seq(50,300,len=50) > > x<-seq(30,80,len=50) > > > > so it is a sort of fitting a 4 dimensional surface to a > regular grid > > > > any suggestions are very much appreciated > > best regards > > Karim > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo> /r-help > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help