R help - Feb 2006 - 3-dim splinefun?

Hello,
  Is the an analogous function to splinefun or approxfun for multivariate data
sets?
  For example, if I have a data set w/ x's and corresponding y's, I can 
use either splinefun or approx fun to find values of y for interpolated  values
of x.
  
  Now, what if I want to do the same thing except with a 3 dim. system?
  If I have a data set with x's, y's, and corresponding z's, is
there any  way to get a best fit interpolated value (not just an image from the 
interp command in the akima package) of z for given x and y values?
  
  thanks for the help,
  colby tanner
  
  
  
		
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