On Jun 19, 2012, at 10:02 AM, David L Carlson wrote:

kde2d is for two dimensional data. The persp graph is 3d.

Huh? The question asked about plotting data that was 2d. The third  
dimension was to be the density. kde2d in package MASS or the  
similarly named function in package KernSmooth would seem to be on  
point here.

No, I don't think that I can use kde2d because the I already have my z data and it is this z data that I need to smooth. My question is analog to smoothing level curves on a map, the altitude is given by data, and one wants to have nice level curves that ignore small variations of the terrain.

Guillaume



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