[R] persp and lines()

Spencer Graves spencer.graves at pdf.com
Wed Feb 18 03:01:24 CET 2004

      The help file for persp (in R 1.8.1, at least) includes a function 
to "Add to existing persp plot".  Have you tried that?  Alternative, 
have you considered "wireframe" in package lattice? 

      hope this helps.  spencer graves

Jeff Jorgensen wrote:

> R-sters:
> I'm interested in keeping data plotted in persp to preserve the 
> wireframe look, I'd just like to change one of the lines drawn (in 
> either the x or y direction) into a different color so that it stands 
> out.
> Or is there some way to add a line (say, via lines(), or abline()) to 
> a persp() plot at the designated x or y that would follow the z 
> surface contour?  I could add a line using 2D representations of the 
> data, but I'd like to use the perspective plot if possible.
> Any advice?
> Cheers,
> Jeff
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