[R] font question on pdf device

[Kari Ruohonen]

Hi,
I wonder if this is something on my machine locally or R in general.

When I do the following:
> plot(c(0,1),c(0,1),main=expression(paste(symbol("D"),"D",sep="")))

I get a plot with a title having uppercase delta followed by "D". But in
the following

> pdf(file="deltaTest.pdf")
> plot(c(0,1),c(0,1),main=expression(paste(symbol("D"),"D",sep="")))
> dev.off()

the uppercase delta looks like O with overstrike slash, i.e. Ø.

Other greek alphabets, such as Gamma, seem to work fine for pdf as well.

My sessioninfo for this is

> sessionInfo()
R version 2.11.1 (2010-05-31) 
x86_64-pc-linux-gnu 

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

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

Many thanks,
Kari