[R] how to plot implicit functions

David Winsemius dwinsemius at comcast.net
Sat Dec 13 04:30:38 CET 2008

The answer I have seen before on this list (but cannot find at the  
moment) was a suggestion to solve for one of the variables in terms of  
the other two and then plot with standard 3d plotting routines. I also  
seem to remember that some of the examples in an RGL vignette had  
examples of graphed "implicit functions". I call them parametric  
fucntions, but that term is used in so many other ways that prevent  
effective searching.

Searching on "rgl parametric function" produced this possibly relevant  
hit (among others):

David Winsemius

On Dec 11, 2008, at 12:57 PM, YIHSU CHEN wrote:

> Dear R users --
> I think this question was asked before but there was no reply to it.
> I would appreciate any suggestion any of you might have.  I am
> interested in plotting several "implicit functions" (F(x,y,z)=0) on
> the same fig.     Is there anyone who has an example code of how to do
> this?
> Thank you
> Yihsu
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