[R] Using postscript() in a script that is source()ed

[Anthony Darrouzet-Nardi]

I have a script that draws 9 graphics which I would like to run by 
source()ing the file. In the script I make objects that contain each 
of the graphics (all lattice objects or functions that contain 
lattice functions). Then at the end of the script, I have a section 
which prints them to separate eps files like this:

postscript(file = "dryoutcover.eps", height = 5, width = 7,
	horizontal = FALSE, onefile = FALSE, paper = "special")
dryoutcover.plot # this is an object created by xyplot and it's one 
of the ones that doesn't print.
dev.off()

When I run the script using source(), only a couple of the graphics 
are drawn in the eps files. For the rest of them, there are blank eps 
files.

The script works properly (the 9 eps files all have graphics in them) 
when I cut and paste the contents of it into R. It also works 
properly if I use source(..., verbose = T) giving output such as:


 eval(expression_nr. 82 )
                 =================
 postscript(file = "dryoutcover.eps", height = 5, width = 7,
    horizontal = FALSE, onefile = FALSE, paper = "special")
curr.fun: symbol postscript
 .. after 'expression(postscript(file = "dryoutcover.eps", height = 
5, width = 7, ''    horizontal = FALSE, onefile = FALSE, paper = 
"special"))'

 eval(expression_nr. 83 )
                 =================
 dryoutcover.plot
 .. after 'expression(dryoutcover.plot)'
 eval(expression_nr. 84 )
                 =================
 dev.off()
curr.fun: symbol dev.off
quartz
     2
 .. after 'expression(dev.off())'
How can I get the non-verbose source() of my script to work?
Anthony
R 1.9.0
Mac OS 10.3.3
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