R help - Sep 2008 - Plot Accessibility

I'm not so sure the original way I stated my issue was clear enough, so
I'll
attempt to elaborate a little bit.

I'd like to make a function that is passed the name of a plot object, and a
lines/point specification, and graphs them all on the same plot.

I don't want to redraw the plot each time, and I don't want the code to
have
any concept of a "first entry" instantiating the plot with plot() in
place
of lines().

Ideally, I'd like something to the effect of:

plot <- createPlot(main = "Hello World", sub = "tiny, little
world", xlim c(-3, 3), ylim = c(-3, 3))

plot <- addElement(plot, lines(col = 'BLUE', x = c(0, 1, 2, 3), y =
c(3, 2,
1, 0)))

Hopefully this laid my problem out a little better.

Thanks in advance for any help you might be able to offer
-John Crepezzi
-- 
View this message in context:
http://www.nabble.com/Plot-Accessibility-tp19575437p19575437.html
Sent from the R help mailing list archive at Nabble.com.

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

if(dev.cur()==1)

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

Jim