I have a function for plotting soil texture that I am having a problem with.
The function is:
plot.psd <- function(sand, clay, ...) {
conv.ter <- function(x, y) {
x.con <- 100 - x - y*cos(1/3*pi)
y.con <- y*sin(1/3*pi)
data.frame(x=x.con, y=y.con)
}
plot(conv.ter(sand, clay), xlim = c(0,100), ylim = c(0,100*sin(1/3*pi)),
axes = FALSE, xlab="", ylab="", ...)
lines(conv.ter(c(100,0), c(0,100)))
lines(conv.ter(c(100,0), c(0,0)))
lines(conv.ter(c(0,0), c(0,100)))
lines(conv.ter(c(85,90), c(0,10)))
lines(conv.ter(c(70,85), c(0,15)))
lines(conv.ter(c(50,43,52,52,80), c(0,7,7,20,20)))
lines(conv.ter(c(43,23,45,52), c(7,27,27,20)))
lines(conv.ter(c(45,45,65), c(27,35,35)))
lines(conv.ter(c(45,45), c(35,55)))
lines(conv.ter(c(45,20,20,23), c(40,40,27,27)))
lines(conv.ter(c(20,0), c(40,60)))
lines(conv.ter(c(20,0), c(27,27)))
lines(conv.ter(c(20,0), c(40,40)))
lines(conv.ter(c(0,8,20), c(12,12,0)))
for(i in seq(10, 90, 10)) {
lines(conv.ter(c(i,i), c(0,(100-i))), lty = 3)
lines(conv.ter(c((100-i),0), c(i,i)), lty = 3)
lines(conv.ter(c(i,0), c(0,i)), lty = 3)
}
text(conv.ter(c(50, 60, -10), c(-10, 55, 55) ), c("Sand", "Clay", "Silt"),
cex = 0.9 )
text(conv.ter(c(0,20,40,60,80,100 ), c(rep(-2, 6)) ), c("0", "20", "40",
"60", "80", "100"), cex = 0.75 )
text(conv.ter(c(103,83,63,43,23,3 ), c(0,20,40,60,80,100) ), c("0", "20",
"40", "60", "80", "100"), cex = 0.75 )
text(conv.ter(c(rep(-3,6)), c(102,82,62,42,22,2)), c("0", "20", "40",
"60", "80", "100"), cex = 0.75 )
}
The label for the Sand axis (first text line above) is not shown.
The second problem I have with this is that the triangle should be
equilateral but when I print
it the triangle is not. If I use par(pty = "s") before the plot.psd call
than the triangle is
always stretched vertically.
Any Ideas?
With best wishes and kind regards I am
Sincerely,
Corey A. Moffet
Instructor
Department of Range, Wildlife, and Fisheries Management
Mail Stop 2125
Texas Tech University
Lubbock, Texas 79409-2125
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Problem w/ axis and distortion in a plotting function
2 messages · Moffet, Corey, Martin Maechler
Hi Corey,
"CoMo" == Moffet, Corey <Corey.Moffet at ttu.edu> writes:
CoMo> I have a function for plotting soil texture that I am
CoMo> having a problem with. The function is:
...........
(it would be helpful if together with the function,
you'd give an example call that we can use as well, i.e., with
"R builtin" or random (sand <- rnorm(...)) data, so we can
easily see what you mean)
CoMo> The label for the Sand axis (first text line above) is
CoMo> not shown.
you have an explicit xlab = "" -- so why would you expect a label?
CoMo> The second problem I have with this is that the
CoMo> triangle should be equilateral but when I print it the
CoMo> triangle is not. If I use par(pty = "s") before the
CoMo> plot.psd call than the triangle is always stretched
CoMo> vertically.
plot(...., asp = 1 ) ## !!!
This is found (only?) on help(plot.default),
a very nice feature and probably much under-used possibility
for specifying and fixing the ASPect ratio.
Does it help?
Martin Maechler <maechler at stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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