[R] Multiple groupedData plots in a postscript file using a loop

[Uwe Ligges]

Karl Knoblick wrote:

> Thanks, but it does NOT work using a loop (your
> example without loop works):
> 
> trellis.device("postscript", file = "PSFile.ps")
> for (i in 1:1)
> {
>   plot(Loblolly)
> }
> dev.off()


Yep, sorry. You need to print() a lattice plot in this case:

trellis.device("postscript", file = "PSFile.ps")
for (i in 1:1)
{
   print(plot(Loblolly))
}
dev.off()


Uwe Ligges


> Just an empty postscript file.
> 
> Karl.
> 
>  --- Uwe Ligges <ligges at statistik.uni-dortmund.de> :> 
> 
>>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
>>
> 
> 
> 
> __________________________________________________________________
>