[R] Ternary or Triangular Plots (soil texture triangle plot)?

Dan Bolser dmb at mrc-dunn.cam.ac.uk
Mon Apr 3 15:40:37 CEST 2006


I am trying to create a triangular plot to show the 'composition' of a 
set of items with three variables (historically the percent sand, silt 
and clay in soil).

So far I have tried the 'soil texture triangle plot' in the package 
plotrix and the 'ternary or triangular plots' in the package cwhtool 
(cwhmisc). Both have strengths and weaknesses, but neither has a 
'standard' or 'generic'  feel about it.

To save myself time I would like to ask the list if there is a preferred 
or standard implementation of the triangle plot that will let me,

* Label the three axes
* Specify a range for the three axis
* Label each point with a string
* Add lines perpendicular to each axis

Or in general if there is an implementation of the triangle plot which 
supports the standard plotting options.

Thanks very much for any pointers,


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