[R] persp and greek symbols in the axes labels

[Stephen Tucker]

I don't know why it doesn't work but I think people generally recommend that
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()]


--- Nathalie Peyrard <Nathalie.Peyrard at toulouse.inra.fr> 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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