Re: [R] piper diagram

From: Jim Lemon <jim_at_bitwrit.com.au>
Date: Tue, 10 Jun 2008 22:34:13 +1000

Dylan Beaudette wrote:
> Hi,
>
> Is anyone on the list familiar with an R implementation of Piper Diagrams?
>
> Example:
> http://faculty.uml.edu/nelson_eby/89.315/IMAGES/Figure%209-78.jpg
>
> I am thinking that two calls to triax.plot (plotrix) along with some kind of
> affine-transformed standard plot would do the trick. Not so sure about the
> final layout, or a nice generalized version for something like lattice.
>
Hi Dylan,
You're correct about the lower two triangle plots, triax.plot would handle these (although there would probably be a bit of hacking about to get the two plots in the right place). I don't understand the upper rhombus. As a third triangle plot I can get it, but the bottom half seems to be either redundant or nonsensical (you can't have negative proportions of components). If I have some time, I'll look up "piper plot" and try to work out what it all means.

Jim



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