[R] 'Extracting' plot area

[Duncan Murdoch]

On 5/21/2008 9:02 AM, Tine wrote:
> Hi!
> 
> Does anyone know hot to save (to png, pdf, ...) only plot area. That is 
> without box around, titles, axis, ...
> I tried: par(mar=c(0,0,0,0)) and it works for internal viewer (linux and 
> windows).
> But when I save the image in png it adds that annoying margin around 
> plot area.
> Any ideas?

Set up the options for no margins after opening the device.  (If you are 
copying from the screen device in Windows, you don't need to do it 
again; presumably the same is true in Linux.  But if you use png() to 
open a png device it will start up with default par settings.  You need 
to set the margins after that.)

For example,

 > png("test.png")
 > par(mar=c(0,0,0,0), xaxs="i", yaxs="i")
 > plot(runif(10000))
 > dev.off()

produces a big ugly plot without those nice margins.

Duncan Murdoch