Plot availability

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

On 9/19/2008 9:32 AM, john crepezzi wrote:

Is it possible to see if a plot is already open before I call lines()?

I don't think so. ?You can see if a graphics device is open by looking
at dev.cur(), but I don't think there's a test for plot.new(). ?I'd just
wrap the call in try() if you're not sure it will work.

Duncan Murdoch

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