[R] two perspective plots in in plot

[Greg Snow]

Probably the easiest way is to use the "wireframe" function in the
lattice package.  The second example in the help shows 2 surfaces (you
do need to combine the data into a single data frame).

If you really want to use the "persp" function, then you could create
the first plot, then call "par(new=TRUE)" and then do the 2nd plot, but
that would take a lot of thinking to get the axes and scales to line up
properly and make it look good.

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Roland Rau
> Sent: Friday, February 09, 2007 9:01 AM
> To: r-help
> Subject: [R] two perspective plots in in plot
> 
> Dear all,
> 
> I would like to put two perspective plots into one plot. The 
> help page for ?persp shows how one can add points and lines 
> but not another perspective plot.
> 
> data(volcano)
> z <- 2 * volcano        # Exaggerate the relief
> x <- 10 * (1:nrow(z))   # 10 meter spacing (S to N)
> y <- 10 * (1:ncol(z))   # 10 meter spacing (E to W)
> ## Don't draw the grid lines :  border = NA persp(x, y, z, 
> theta = 135, phi = 30, col = "green3", scale = FALSE,
>      ltheta = -120, shade = 0.75, border = NA, box = FALSE)
> 
> and now I would like to include another surface. I was hoping 
> for a possibility like add=TRUE such as in contour:
> 
> persp(x, y, z+10, theta = 135, phi = 30, col = "red", add=TRUE)
> 
> Can someone point out to me how it can be accomplished (maybe 
> a function in another package)?
> 
> Thank you very much,
> Roland
> 
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> 
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