R help - Apr 2006 - 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.

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.

______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html

There is also the triplot function in the TeachingDemos package that
does some of what you want (but always shows the full range 0 to 1 on
all axes).

I expect that each of the implementations out there does part of what
you want and you may need to find which will come closest, or find which
is easiest to modify to do all the things you want.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 
> -----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 7:41 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.
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
>