[R] adding graphics after dev.copy

[Giampiero Salvi]

Hi,
now I see the problem is that it is not possible to run dev.copy from
non-interactive devices (see the post in r-devel: "[Rd] feature
enhancement request & patch: dev.control(displaylist='en (PR#3424)"
Tue 08 Jul 2003 - 03:50:38 EST).

I'll move this question to the r-devel list.

Giampiero


On Wed, 28 Feb 2007, Giampiero Salvi wrote:

> Hi,
> I am trying to create a plot and save it as pdf to the file
> file1.pdf, then add some details and save the new plot as file2.pdf.
> I would like to avoid repeating all the instructions needed to create
> file1.pdf when I create file2.pdf.
>
> This is what I have tried:
>
> pdf(file="file1.pdf")
> plot(1:10)
> dev.copy(pdf,file="file2.pdf")
> points(2,3)
> dev.off()
> dev.off()
>
> When I run points I get the error:
> Error in plot.xy(xy.coords(x, y), type = type, ...) :
>         plot.new has not been called yet
>
> When I try to do the same with the x11 device, it works:
> x11()
> plot(1:10)
> dev.copy(x11)
> points(2,3)
> dev.off()
> dev.off()
>
> Can someone tell me what goes wrong in the first case and why the x11
> and pdf devices behave differently?
>
> Thank you!
> Giampiero
>