[R] 2D interpolation function

Jim Lemon bitwrit at ozemail.com.au
Tue May 22 13:38:21 CEST 2001

As part of a project I am doing, I had to present a 2D table as a
surface.  This was fairly straightforward (using persp), but I needed to
interpolate points to make it sort of pretty.  This was done by using
quadratic interpolation between the existing points to smooth out the
surface a bit.  As I couldn't find an R function that did this, I wrote
an admittedly nasty pair of functions that will interpolate any
reasonable number of equally spaced points between the values of an
object produced by table(), smoothed with any reasonable power function
of the distance.  In practice, this means I tested it with up to four or
five interpolated points up to a cubic interpolation.

If anyone is interested in telling me:

a) I overlooked an existing function (p~0.95)

b) This would be a useful function for them (p~0.01)

I would be happy to hear about it.


PS - I assumed that the remaining 0.04 would be the probability that no
one was interested.

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