Patrick,

The reason I'm having a problem is because R only allows a maximum of 64
devices to be open at one time. If it allowed more than that, I wouldn't
have a problem. One way to get around that problem would be if I could close
a device and then append to it later, but there doesn't seem to be a way to
do that. My code works something like the following:

iters <- 1:100
obj.list <- ( long list of complex objects, of which there are > 64 )
device.list <- (holds a reference to all postscript devices, one for each
object in obj.list)

for ( i in iters ) {
   for( j in length(obj.list) ) {
      dev.set( device.list( j ) )
      # do plotting and other stuff for this list member to the j-th file,
appending to what has
      # been plotted before now
   }
}
# close all devices

This code fails because I cannot have more than 64 devices at a time. If it
were possible, every time the inner loop is executed, to set the current
device to the one corresponding to that list member, append to the (possibly
non-empty) postscript file and then close the device at the end of the inner
loop, my problem would be solved. Can you figure out a way to do this?

Thanks,

Alex

On Tue, Dec 30, 2008 at 12:49 AM, Patrick Connolly <
p_connolly@slingshot.co.nz> wrote:

> On Mon, 29-Dec-2008 at 02:57PM -0500, Alex Pine wrote:
>
> |> Hello all,
> |>
>
> |> My question has to do with writing to pdf/ps files. Currently, my R
> |> program requires 100+ pdf devices to be open, which is over the
> |> limit of 64 devices that can be open at the same time, causing R to
> |> throw an exception. My problem could be solved if I could append to
> |> a pdf file after its initial device has been closed, but so far I
>
> If you told us why you've closed the device, we'd understand what your
> problem is.  Why can't you keep the same device open and as many pages
> as you like will be appended before you do the dev.off() thing?  You
> can change par settings for the individual pages if necessary.
>
> [...]
>
> HTH
> --
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
>    ___    Patrick Connolly
>  {~._.~}                         Great minds discuss ideas
>  _( Y )_                        Middle minds discuss events
> (:_~*~_:)                        Small minds discuss people
>  (_)-(_)                                   ..... Anon
>
> ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
>

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