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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