[R] Plot Accessibility

Jim Lemon jim at bitwrit.com.au
Sat Sep 20 13:07:37 CEST 2008

john crepezzi wrote:
> Is there any way to determine if a plot exists before running lines()?
Hi John,
I use :


which usually indicates that the current device is the null device, and 
therefore no plot windows are active. See the code for triax.plot.


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