Thanks Duncan (and David). I couldn't get back to my computer until
today. I understand it pretty well now and I'm able to get what I need.
On a side note, I have had a hard time getting rgl to work. For the
moment, I have to compile without libpng and ftfonts, and when I load
the package I get an error related to OpenGL (from memory, something
like "no GLX extension found"). I'll write more as soon as I'm able.
Regards,
Marc Chiarini
Duncan Murdoch wrote:
On 22/11/2009 1:07 AM, Marc Chiarini (Tufts) wrote:
Dear R Community:
Recently, I have managed to plot some really useful graphs of my
research data using persp(). I have even figured out how to overplot
rectangular regions (corresponding to submatrices) with a different
color. This is accomplished by using par(new=T). I am now searching
for a way to "highlight" a set of (possibly non-contiguous) facets
with a specific color, e.g., the facet between each set of four
points whose values are all above a certain threshold. An example
would be coloring the raised corners of the classic sombrero (found
in example(persp)) differently from the rest of the sombrero. I feel
like the last example in persp() is pointing me in the right
direction, but I'm not quite getting it. Any help is much appreciated.
Think of the facets as an nx-1 by ny-1 matrix. Pass the col arg by
creating a matrix of this shape. (A vector version of the data in the
matrix would also be good enough.)
If you pass something shorter, it will be recycled to that length.
You could also use persp3d from the rgl package, but an important
difference is that it colours all nx by ny vertices, and interpolates
colours on the facets. So you can't use the same colour matrix as in
persp.
Duncan Murdoch
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