Try this: if(length(dev.list()) == 0) plot(rnorm(100), type="l") else (lines(rnorm(100)))
On 07/12/2007, Roger Levy <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > Assistant Professor Phone: 858-534-7219 > Department of Linguistics Fax: 858-534-4789 > UC San Diego Web: http://ling.ucsd.edu/~rlevy > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
