smoothing a matrix (interpolate in plane)

the thin plate spline, or tensor product smooths built into `mgcv' might be 
useful here (by default mgcv does automatic bandwidth selection for these).
Hi R-users,

I'd like to smooth a matrix to dismiss spikes and to interpolate in plane

example of a matrix:
Map[1:3,1:3]

      [,1] [,2] [,3]...
[1,] 34.4 34.2 35.1
[2,] 33.4 34.2 35.4
[3,] 34.1 33.2 32.1
....

dim(Map)[1] =/= dim(Map)[2]

What functions can I use?

Thanks a lot for any response, M

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smoothing a matrix (interpolate in plane)

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