[R-sig-eco] Plotting ternary diagrams

[Michael Melnychuk]

See also the "soil texture plot" and "ternary plot" in the R Graph 
Gallery. You can find source code for each of them there.

http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=76
http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=34

cheers,
Mike

Phil Novack-Gottshall wrote:
> Hi all,
> 
> Can anyone point me to a function for plotting a ternary diagram (a 
> triangular plot; typically, each axis ranges 0-100% with cumulative 
> value for each point adding to 100% along all three axes)?  It's 
> frequently used by geologists to plot sedimentological or mineralogical 
> composition, and I think I've seen it used in biome mapping 
> (temperature/elevation/moisture).
> 
> A bit further afield, do any functions exist to extend this to 4 axes, 
> as a pyramidal quarternary diagram?
> 
> Thanks for any advice,
> Phil
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   Phil Novack-Gottshall                        pnovackg at westga.edu
> 
>   Assistant Professor
>   Department of Geosciences
>   University of West Georgia
>   Carrollton, GA 30118-3100
>   Phone: 678-839-4061
>   Fax: 678-839-4071
>   http://www.westga.edu/~pnovackg
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
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