R help - Nov 2010 - Troubles in plotting to a postscript file (not to png)

Dear R users,

I am trying to produce some plots in a postscript file, but I am 
experiencing some issues. I open the device with

-----------------------------
setPS()
postscript (file='gs_mcmc_dust.ps',width=5*3,height=5*3,horizontal = 
FALSE, paper = "special",family = 
"ComputerModern",encoding="TeXtext.enc")#, onefile = FALSE
-----------------------------

(it's a 9x9 multiplot) and I close it with

-----------------------------
   dev.off()
-----------------------------

Here are my problems:

-) xlab=expression(paste(lambda,"(",~mu,m,")")) : it
correctly prints
the "mu" greek letter but it fails for the "lambda" letter,
leaving a
blank space
-) text(min(mchain[2,]),max(tdensity$y),substitute( T[disk,med] == tmed 
%+-% tstd (K),list(tmed=tmed,tstd=tstd)),pos=4,cex=1.5  ) : it prints 
everything, but the "+-" symbol and "(K)" overlap with the
substitute
for tmed and tstd respectively. How can I force a blank space between 
numbers and symbols? Also, how can I set the number of decimal digits 
for tmed and tstd? ( option(digits=4) does not work )
-) once I close the R session without saving it (I answer "n" when 
quitting), the content of the ps file is erased. Do you know why?

I solve these problems plotting to a PNG device, but a postscript file 
is what I need.

Can you help me, please?

Thank you very much in advance

Cheers

Gaetano

Hi guys,

to make it easier, here is a simple case with the same issues. I use the 
short function below to make the attached PS file.

Things to fix:

-) the greek letter "lambda" is not printed, while "mu" is
printed (see
the plot command)
-) the annotation inside the plot area: the "+-" symbol and
"(K)"
overlap with the substitute for tmed and tstd respectively (see the text 
command). Also, how can I set the number of decimal digits for tmed and 
tstd? (option(digits=4) does not work )

Moreover, I'd like to make the characters thicker. Is there any way? 
Finally, once I close the R session without saving it (I answer "n"
when
quitting), the content of the ps file is erased. Do I miss something in 
writing the function?

Thanks

Gaetano


plot_example=function()
{

setPS()
postscript (file='plot_example.ps',width=5,height=5,horizontal = FALSE, 
paper = "special",family =
"ComputerModern",encoding="TeXtext.enc")

tmed<-1.23456789
tstd<-1.23456789

plot(c(0,1),c(0,1),xlab=expression(paste(lambda,mu,T)),main="",sub="(a)")#"lambda"
not printed
text(.0,.8,substitute( T[disk,med] == tmed %+-% tstd 
(K),list(tmed=tmed,tstd=tstd)),pos=4,cex=1.5  )#overlapping symbols and 
numbers

dev.off()

}
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