[R] "Error: object 'cloud' not found"

Hi, I installed the lattice package so I can plot 3D "cloud" scatterplots: > install.packages("lattice") But (after successfully installing from the Berkeley mirror), R insists it cannot find the cloud function, part of the lattice package: > cloud Error: object 'cloud' not found What d

[R] Variant of cloud with "sticks" from points to surface

Hi, I'd like to (1) plot a perspective view of a 3D scatterplot, with a fitted (curved) surface; (2) have a "stick" from each point vertically to the surface. The latter helps one visualize where a point lies in 3D, relative to the surface. Is there a variant of the cloud function (lattic