[R] How to estimate or approximate a 3-D surface

[Feng Zhang]

Hey, R-listers

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?

Thanks for your time and point.

Fred