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

[bady at univ-lyon1.fr]

hi, hi all

you can use the function 'triangle.plot' of the library ade4.
there are several example in the help (?triangle.plot).


Pierre





Selon Christos Hatzis <christos at silicoinsights.com>:

> You might want to try 'ternaryplot' from the 'vcd' package.  I haven't used
> it myself but it appears to be quite flexible and since it is based on the
> grid graphics system it is highly extensible.
>
> -Christos
>
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Dan Bolser
> Sent: Monday, April 03, 2006 9:41 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Ternary or Triangular Plots (soil texture triangle plot)?
>
>
> Hi,
>
> 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,
>
> Dan.
>
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