[R] add points to 3D plot using p3d {onion}

Hi, Can anyone guide me as to how I can add points to a p3d() plot from the onion package?  I want to plot points with different colors on the same 3D plot.  Perhaps I can do this without adding points but somehow directing the 'h' parameter to give different color to points based on a factor I as

[R] problem configuring package udunits

Hi R Users, I am new to running R on a Linux platform (I'm used to Windows) - I'm running R 2.7.0 on Ubuntu 7.10 (Gutsy) as sudo (without Emacs). My architecture is Pentium D (x86_64). I am having problems successsfully configuring the downloaded package 'udunits'. When I execute > install.p