On 9/28/07, Duncan Murdoch <[EMAIL PROTECTED]> wrote: > >>> Can R plot graphs like the one at > >>> > >>> http://www.mathwords.com/f/f_assets/floor_graph.gif > >>> > >>> with the balls at the discontinuity points? > >>> > >> You can use segments() to draw the segments and symbols() to draw the > >> balls. For example, > >> > >> plot(1,1,type='n', xlim=c(1,10), ylim=c(1,10)) > >> segments(1:9, 1:9, 2:10, 1:9) > >> symbols(2:10, 1:9, circles=rep(0.1,9), inches=FALSE, bg="white",add=T) > >> symbols(1:9, 1:9, circles=rep(0.1,9), inches=FALSE, bg="black",add=T) > >> > >> This depends on the order of drawing, because the white background of > >> the first circles obscures the ends of the segments. > >> > > > > Thanks, Jim and Duncan. It would help to have transparent backgrounds > > for the white balls. > > > Then it's even easier: just use points(), with pch=1, e.g. > > plot(1,1,type='n', xlim=c(1,10), ylim=c(1,10)) > segments(1:9, 1:9, 2:10, 1:9) > points(2:10, 1:9, pch=1, cex=2) > points(1:9, 1:9, pch=16, cex=2)
Thanks, Duncan. That is a nice solution. Paul ______________________________________________ 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.
