[R] re:Ternary Plots

[c.farrow@compserv.gla.ac.uk]

David,
Greetings from the west coast!

Here is my ternary or triangular diagram function.
Geologists use them a lot too.


Usage is as follows

# some random data in thre variables
c1<- runif(5, 10, 20)
c2<- runif(5, 1, 5)
c3 <- runif(5, 15, 25)
# basic plot
tri(c1,c2,c3)
# plot with different symbols and a grid
tri(c1,c2,c3, symb=7, grid=T)

Hope this helps,

Colin.



> Does anybody know about ternary (tertiary?) plotting functions for R -
> they're triangular things used much beloved by chemists for plotting
> compositional data.
-- 
Colin Farrow
Computing Service, University of Glasgow, Glasgow G12 8QQ
Tel: 0141 330 4862, c.farrow at compserv.gla.ac.uk
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