[R] polynomial fit
Liaw, Andy
andy_liaw at merck.com
Mon Oct 6 15:08:22 CEST 2003
Or even mars() in the mda package...
Andy
> From: Thomas W Blackwell [mailto:tblackw at umich.edu]
>
> 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
>
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