[Rd] xyz.coords(.)

[Uwe Ligges]

In order to improve scatterplot3d(.), Martin Maechler wrote:

> Maybe you could extend  xy.coord() to xyz.coord(), a function that would be
> useful in a more general context.

If you are interested, have a look at 
http://www.statistik.uni-dortmund.de/leute/ligges.htm
for source and examples of xyz.coords(.).
I only added (changed) some lines to xy.coords(.) of R's base package.

Discussion and comments are welcome.

Best regards,
Uwe Ligges
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