R help - Jan 2004 - Multiple groupedData plots in a postscript file using a loop

Hallo!

I want to plot multiple grouped data in a postscript
file using a loop. As I use a loop no plot (or just
one empty plot) is generated. Here an example:

library(nlme)
data(Loblolly) # example data from nlme
postscript("PSFile.ps")
for (i in 1:1) # just as example
{
	plot(Loblolly)
}
dev.off()

Result: Just an empty PSFile.ps.
(Withoput the loop it works.

May anybody help?

Karl


__________________________________________________________________

Karl Knoblick wrote:
> Hallo!
> 
> I want to plot multiple grouped data in a postscript
> file using a loop. As I use a loop no plot (or just
> one empty plot) is generated. Here an example:
> 
> library(nlme)
> data(Loblolly) # example data from nlme
> postscript("PSFile.ps")
> for (i in 1:1) # just as example
> {
> 	plot(Loblolly)
> }
> dev.off()
Note that this is a lattice plot:

  class(Loblolly)
[1] "nfnGroupedData" "nfGroupedData" 
"groupedData"    "data.frame"

Thus, the method plot.nfnGroupedData() producing a lattice plot is 
called by the generic plot().

So, you don't want to start postscript(), but
  trellis.device("postscript", file = "PSFile.ps")
  plot(Loblolly)
  dev.off()

Uwe Ligges

> Result: Just an empty PSFile.ps.
> (Withoput the loop it works.
> 
> May anybody help?
> 
> Karl
> 
> 
> __________________________________________________________________
> 
> 
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On Saturday 17 January 2004 08:58, Karl Knoblick wrote:
> Hallo!
>
> I want to plot multiple grouped data in a postscript
> file using a loop. As I use a loop no plot (or just
> one empty plot) is generated. Here an example:
>
> library(nlme)
> data(Loblolly) # example data from nlme
> postscript("PSFile.ps")
> for (i in 1:1) # just as example
> {
> 	plot(Loblolly)
replace this line with 

        print(plot(Loblolly))

(plot(Loblolly) produces a ``trellis'' object, which needs to be
'print'-ed
for anything to be actually plotted. Inside a loop (or a function), this does 
not happen unless you call print() explicitly)
> }
> dev.off()
>
> Result: Just an empty PSFile.ps.
> (Withoput the loop it works.
>
> May anybody help?
>
> Karl

On Sat, 17 Jan 2004, Karl Knoblick wrote:
> My problem was solved by using 
> trellis.device(win.metafile,file="Loblolly.wmf",
> color=F)
> instead of win.metafile("Loblolly.wmf").
> (other answers helped also)
> 
> (What I found for getting similiar plots as postscript
> was color=F in the trellis.device(...) command)
> 
> Thanks to all!
> Karl.
> 
> BTW win.metafile("Loblolly.wmf") does not work for me
> with the following versions I updated recently:
> R version 1.8.0, 2003-10-08
But, the current version is R 1.8.1 and it *does* work in a current
version of R (1.8.1 or R-patched or R-devel).

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595