[R] persp and greek symbols in the axes labels

[Nathalie Peyrard]

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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