Hello, please excuse me if this is a repost, I think I got confused 
about how to reply. Anyway, I posted the message below about a day and a 
half ago through Nabble but have not been cleared until today. Here it 
goes again. Please bear with me I will get better with time.

----Start of message sent about two days ago---

Hello all, thank you very much for the replies and I am very sorry for 
being so late to come back to the discussion, I was on a field trip 
without internet access.

@ Ben

I have the problem any time I try to use the mu symbol or the degree 
symbol using expression() (the only way I know how to do it). Yvonnick's 
code is a good example, I have just added the mu and the degree symbol:

pdf("Test.pdf")
plot(1:10,xlab=expression(mu), ylab=expression(C*degree~pi))
dev.off()

Even if I don't make the pdf (i.e. just plot on the X11 device), like in 
Yvonnick's example, the degree symbol is still showing as that 
gamma-like symbol, pi is shown like an inequality symbol but mu is shown 
right (on the X11).

@ Erik and Yvonnick

I think Yvonnick's problem is the same I have (i.e. it is not restricted 
to pdf files, it also happens in the X11 device, jpg and png). Further, 
if I create a pdf in Ooo Writer that contains mu, pi or degree symbols 
and I export them as pdf, they are rendered just fine (similar to what 
Peter reported, not sure whether he has problems in the X11 device too), 
the problem is restricted to R-generated graphs.

I am going to try Erik's suggestion tonight (sorry I could not try it 
before posting, I am still catching up with work accumulated from my 
trip). However, would this fix the problem in rendering in the X11 
device? I also feel this might not be just a pdf-viewer issue, but I am 
an absolute novice.

    ----End of message sent about two days ago---

Since then, i tried Erik's suggestion, but I could not find  either 
'~/.fonts.conf' or '/etc/fonts/local.conf' in my system (at least with 
those exact names).

I also got a reply from Prof. Ripley (quote below), I am working on it 
now, but maybe more experienced users will be more efficient in using it 
than me.

"Your first para confirms it.  The problem is font selection by 
fontconfig, which R's X11 device and Evince etc use and Xpdf or Acroread 
do not.  See ?X11 for ways to debug this."

Thanks!

Eduardo

 > sessionInfo()
R version 2.11.1 (2010-05-31)
i486-pc-linux-gnu

locale:
  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
  [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
  [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

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