[R] if/else for plot/lines?

[hadley wickham]

On Dec 7, 2007 4:28 AM, 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.

You might want to look at the ggplot2 package,
http://had.co.nz/ggplot2/, which exposes plots as objects that can be
easily manipulated.

Hadley

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