[R] if/else for plot/lines?

[Henrique Dallazuanna]

Try this:

if(length(dev.list()) == 0) plot(rnorm(100), type="l") else (lines(rnorm(100)))


On 07/12/2007, Roger Levy <rlevy at ucsd.edu> wrote:
> I'm interested in writing a function that constructs a new plot on the
> current graphics device if no plot exists there yet, but adds lines to
> the existing plot if a plot is already there.  How can I do this?  It
> seems to me that the exists() function might be co-opted to do this, but
> it's not obvious how.
>
> Many thanks,
>
> Roger
>
> --
>
> Roger Levy                      Email: rlevy at ucsd.edu
> Assistant Professor             Phone: 858-534-7219
> Department of Linguistics       Fax:   858-534-4789
> UC San Diego                    Web:   http://ling.ucsd.edu/~rlevy
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O