"chemical" plot - R-help | R Mailing Lists

Tue, Nov 5, 2002 1:56 PM #

On Wed, Nov 06, 2002 at 10:22:05AM +0100, Christian Hoffmann wrote:

ternary plots.

http://finzi.psych.upenn.edu/R/Rhelp01/archive/1000.html

Cheers

Jason

Indigo Industrial Controls Ltd.
64-21-343-545
jasont at indigoindustrial.co.nz
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Christian Schulz

Wed, Nov 6, 2002 1:22 AM #

Hi all,

May be there is a plot which shows 3 variables in a triangle, their sum 
being constant. I have forgotten its name, and a search in the engine using 
"plot" did not help.

Does anyone know of such a procedure in R or S?

Thank you
--christian

Dr.sc.math.Christian W. Hoffmann
Mathematics and Statistical Computing
Landscape Dynamics and Spatial Development
Swiss Federal Research Institute WSL
Zuercherstrasse 111
CH-8903 Birmensdorf, Switzerland
phone: ++41-1-739 22 77    fax: ++41-1-739 22 15
e-mail: christian.hoffmann at wsl.ch
www: http://www.wsl.ch/staff/christian.hoffmann/

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Brian Ripley

Wed, Nov 6, 2002 4:30 AM #

A ternary plot.

library(MASS)
?Skye

will give you code and an example.

On Wed, 6 Nov 2002, Christian Hoffmann wrote:

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Ben Bolker

Wed, Nov 6, 2002 6:18 AM #

They're called "ternary plots"

  http://maths.newcastle.edu.au/~rking/R/help/01a/0954.html
http://maths.newcastle.edu.au/~rking/R/help/01a/1355.html
http://maths.newcastle.edu.au/~rking/R/help/01a/0971.html
http://finzi.psych.upenn.edu/R/Rhelp01/archive/6206.html

  etc.

On Wed, 6 Nov 2002, Christian Hoffmann wrote:

318 Carr Hall                                bolker at zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
Box 118525                                   (ph)  352-392-5697
Gainesville, FL 32611-8525                   (fax) 352-392-3704

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A.J. Rossini

Wed, Nov 6, 2002 6:53 AM #

christian> May be there is a plot which shows 3 variables in a
    christian> triangle, their sum being constant. I have forgotten
    christian> its name, and a search in the engine using "plot" did
    christian> not help.

trilinear plot is one term.

    christian> Does anyone know of such a procedure in R or S?

I don't know.

best,
-tony

A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
U. of Washington Biostatistics		rossini at u.washington.edu	
FHCRC/SCHARP/HIV Vaccine Trials Net	rossini at scharp.org
-------------- http://software.biostat.washington.edu/ ----------------
FHCRC: M: 206-667-7025 (fax=4812)|Voicemail is pretty sketchy/use Email
UW:   Th: 206-543-1044 (fax=3286)|Change last 4 digits of phone to FAX
(my tuesday/wednesday/friday locations are completely unpredictable.)



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David Meyer

Wed, Nov 6, 2002 6:56 AM #

...and you might also check out the new package `vcd' (Visualizing
Categorical Data)
soon to appear on CRAN.

-d

Mag. David Meyer		Wiedner Hauptstrasse 8-10
Vienna University of Technology		A-1040 Vienna/AUSTRIA
         Department of			Tel.: (+431) 58801/10772
Statistics and Probability Theory	mail: david.meyer at ci.tuwien.ac.at
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PIKAL Petr

Wed, Nov 6, 2002 7:38 AM #

Some time ago I coppied following script for plotting ternary 
graphs

#----------------------------------------------------------------------------
-----
# 
# Colin Farrow
# Computing Service, University of Glasgow, Glasgow G12 8QQ
# c.farrow at compserv.gla.ac.uk


tri<-
function(a, f, m, symb = 2, grid = F, ...)
{
 ta <- paste(substitute(a))
 tf <- paste(substitute(f))
 tm <- paste(substitute(m))

 tot <- 100/(a + f +m)
 b <- f * tot
 y <- b * .878
 x <- m * tot + b/2
 par(pty = "s")
 oldcol <- par("col")
 plot(x, y, axes = F, xlab = "", ylab = "", xlim = c(-10, 110), ylim
   = c(-10, 110), type = "n", ...)
        points(x,y,pch=symb)
 par(col = oldcol)
 trigrid(grid)
 text(-5, -5, ta)
 text(105, -5, tm)
 text(50, 93, tf)
 par(pty = "m")
 invisible()
}
"trigrid"<-
function(grid = F)
{
 lines(c(0, 50, 100, 0), c(0, 87.8, 0, 0))	#draw frame
 if(!grid) {
  for(i in 1:4 * 20) {
   lines(c(i, i - 1), c(0, 2 * .878))	#side a-c (base)
   lines(c(i, i + 1), c(0, 2 * .878))
   T.j <- i/2	#side a-b (left)
   lines(c(T.j, T.j + 2), c(i * .878, i * .878))
   lines(c(T.j, T.j + 1), c(i * .878, (i - 2) * .878))
   T.j <- 100 - i/2	#side b-c (right)
   lines(c(T.j, T.j - 2), c(i * .878, i * .878))
   lines(c(T.j, T.j - 1), c(i * .878, (i - 2) * .878))
  }
 }
 else {
  for(i in 1:4 * 20) {
# draw dotted grid
   lines(c(i, i/2), c(0, i * .878), lty = 4, col = 3)	#
   lines(c(i, (50 + i/2)), c(0, .878 * (100 - i)), lty = 4,
    col = 3)	# /
   lines(c(i/2, (100 - i/2)), c(i * .878, i * .878), lty
     = 4, col = 3)	# -
  }
  par(lty = 1, col = 1)
 }
}

On 6 Nov 2002 at 10:22, Christian Hoffmann wrote:

Petr Pikal
petr.pikal at precheza.cz
p.pik at volny.cz


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