Have you tried looking at packages mgcv or gss? 

> Now I am going to estimate or approximate a surface in
> 3-D space given a large enough number of (x,y,z) data sets.
> 
> So for these 3-D data points, is it possible to get a surface
> function, like z=f(x,y) to represent this underlying surface?

Simon
_____________________________________________________________________
> Simon Wood [EMAIL PROTECTED]        www.stats.gla.ac.uk/~simon/
>>  Department of Statistics, University of Glasgow, Glasgow, G12 8QQ
>>>   Direct telephone: (0)141 330 4530          Fax: (0)141 330 4814

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