[R] 3-dim splinefun?

From: Colby Tanner <ct_zero_at_yahoo.com>
Date: Fri 10 Feb 2006 - 11:02:46 EST

  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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