Take a look at the

kde2d
function in the MASS package, maybe it helps.

Best
kd



2012.06.19. 14:26 keltezéssel, Guillaume Chapron írta:
> Hi,
>
> I'm unable to find a way to smooth data for a persp() graph.
>
> Example, suppose that I have data x,y,z like this:
>
> x<- 1:10
> y<- 1:10
>
> k<- 20
> z<- outer(x, y, "*") + matrix( k*runif(100, -1, 1), 10, 10)
> persp(x, y, z, theta = 35, phi = 25)
>
> The graph is not very nice. Is there a way to smooth the z data so that at the end the graph would look more like something like that:
>
> k<- 2
> z<- outer(x, y, "*") + matrix( k*runif(100, -1, 1), 10, 10)
> persp(x, y, z, theta = 35, phi = 25)
>
> There seems to be many smoothing functions in R (e.g. loess) but I have not been able to find one for a 3D graph.
>
> Thanks!
>
> Guillaume
>
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