[R] bivariate weighted kernel density estimator

[Adrian Baddeley]

Erich Neuwirth writes:

> Is there code for bivariate kernel density estimation?
> ...
> but none of them seems to accept a weight parameter

In package 'spatstat' the function density.ppp performs weighted kernel smoothing, 
including bivariate kernel density estimation.

At the moment it only offers the Gaussian kernel
but we plan to include other kernels.

Adrian Baddeley