The simplest way would be to have a flag, an indicator variable that
stores a value that indicates if a plot has been done before. Something
like this
plot (do my first plot here...)
is.plot=T
.... later in the code...
if (is.plot) {plot (do new plot here)} else {lines(add lines to the
previous plot)}
Julian
Roger Levy 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
>
>
--
Julian M. Burgos
Fisheries Acoustics Research Lab
School of Aquatic and Fishery Science
University of Washington
1122 NE Boat Street
Seattle, WA 98105
Phone: 206-221-6864
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
