[R] What does persp() return?

David Brahm brahm at alum.mit.edu
Thu Aug 1 19:33:34 CEST 2002

I want to plot some 3D points on top of the grid produced by persp().

On 2/22/01, Paul Murrell <paul at stat.auckland.ac.nz> wrote in R-help:
> In S-Plus, persp() returns a value that can be used to transform 3D 
> locations to 2D, but this sort of thing is not (yet) available in R.

But persp() does return something (in R-1.5.1): a 4x4 matrix which in the C
code is called the "viewing transformation matrix", VT.  Can VT be used to plot
additional points?  If not, is such a thing in the works?

Paul also suggested Uwe Ligges's "scatterplot3d" package, which is very nice
but seems better at producing points than grids.

                              -- David Brahm (brahm at alum.mit.edu)
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list