function in order to plot the same graph to postscript and pdf

Hi,

I've written a function in order to plot the same graph in a postcript
and in a pdf file. Unfortunately, the second graph is always empty,
i.e.:

plot.both <- function{myplot, filename}{
  pdf(file=paste(filename, ".pdf", sep=""))
   myplot
  dev.off()
  postscript(file=paste(filename, ".eps", sep=""))
   myplot
  dev.off()
}

yields in a correct pdf but an empty eps file. However something like
this:

plot.both <- function{myplot1, myplot2, filename}{
  pdf(file=paste(filename, ".pdf", sep=""))
   myplot1
  dev.off()
  postscript(file=paste(filename, ".eps", sep=""))
   myplot2
  dev.off()
}

yields the expected results even if myplot1 and myplot2 are identical.
What are the myplot objects? Expressions or graphical objects that are
printed?

In any case, a good recommendation for this kind of stuff is to look at
Sweave() in the utils package. I guess you're writing your thesis in
LaTeX...and Sweave is a great possibility to mix LaTeX code and R code
which for example generates both pdf and eps graphics.
Z
Does somebody know, how I can implement the desired (first) function?

Ronny

PS: My system is: Linux Debian Unstable and R-Version:  2.0.1.

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function in order to plot the same graph to postscript and pdf

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