[R] polynomial fit
Thomas W Blackwell
tblackw at umich.edu
Mon Oct 6 14:17:53 CEST 2003
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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