On Tue, 24 Jul 2007, Stephen Tucker wrote:
I don't know why it doesn't work but I think people generally recommend that
It has never been implemented, and I believe the main reason is that the
labels are plotted at an angle other than a multiple of 90 degrees. Not
all devices can do that, and rotated plotmath text can look quite ugly.
And of course this _is_ documented in ?persp
xlab, ylab, zlab: titles for the axes. N.B. These must be character
strings; expressions are not accepted. Numbers will be
coerced to character strings.
you use wireframe() in lattice rather than persp(), because wireframe is more
customizable (the pdf document referred to in this post is pretty good):
http://tolstoy.newcastle.edu.au/R/e2/help/07/03/12534.html
Here's an example:
library(lattice)
library(reshape)
x <- 1:5
y <- 1:3
z <- matrix(1:15,ncol=3,dimnames=list(NULL,y))
M <- melt(data.frame(x,z,check.names=FALSE),id=1,variable="y")
wireframe(value~x*y,data=M,
screen=list(z=45,x=-75),
xlab=expression(kappa[lambda]),
ylab=as.expression(substitute(paste(phi,"=",true,sigma),
list(true=5))),
zlab = "Z")
[you can play around with the 'screen' argument to rotate the view, analogous
to phi and theta in persp()]
Of course, that does not rotate the labels. If unrotated labels are
acceptable, you can easily set up a new coordinate system (by par(usr=))
and call text() to put labels where you want on that. You can even try
rotating them via srt=.
There would be no harm in implementing this for use on devices where it
will work: a nice self-contained project for someone who would like to
learn about R internals.
--- Nathalie Peyrard <[EMAIL PROTECTED]> wrote:
Hello,
I am plotting a 3D function using persp and I would like to use greek
symbols in the axes labels.
I have found examples like this one on the web:
plot(0,0,xlab=expression(kappa[lambda]),ylab=substitute(paste(phi,"=",true,sigma),list(true=5)))
this works well with plot but not with persp:
with the command
persp(M,theta = -20,phi =
0,xlab=expression(kappa[lambda]),ylab=substitute(paste(phi,"=",true,sigma),list(true=5)),zlab
= "Z")
I get the labels as in toto.eps
Any suggestion? Thanks!
Nathalie
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