Hi:

Check out this post on R-help from February, and look carefully at the
solution of Walmes Zeviani - I believe it's close to what you're requesting:

http://r.789695.n4.nabble.com/Triangular-filled-contour-plot-td1557386.html

HTH,
Dennis

On Fri, Oct 22, 2010 at 6:15 PM, Yunting Sun <yunting.sun@gmail.com> wrote:

> Hello,
>
> anyone knows if there is a way in R to draw contour on a simplex based on a
> function f(x,y,z)  with domain (x+y+z = 1)?
>
> Thank you!
>
> gigi
>
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