[R] Looking for functions that do the "nearest neighbor method" and the "variable kernel method"

[Jonathan Wang]

Dear List,

Please confirm the following:

It may be my eyes playing trick on me, but I can't seem to find functions
that do the "nearest neighbor method" and the "variable kernel method" for
kernel smoothing and density estimation corresponding to the book:

Silverman, B.W., (1986) "Density Estimation for Statistics and Data
Analysis".

With appreciation,