Very cool. Sadly, as far as I can tell, it doesn't work with ggplot though :(
> x<-runif(1e6) > y<-runif(1e6) > system.time(plot(x,y,pch='.')) user system elapsed 0.824 0.012 0.845 > system.time(plot(x,y)) user system elapsed 33.422 0.016 33.545 > system.time(print(qplot(x,y))) user system elapsed 45.142 0.228 45.687 > system.time(print(qplot(x,y,pch='.'))) user system elapsed 47.483 1.060 49.040 > system.time(print(qplot(x,y,shape='.'))) user system elapsed 44.807 0.689 45.710 On Fri, Nov 18, 2011 at 11:03 AM, Sarah Goslee <sarah.gos...@gmail.com>wrote: > Hi all, > > I'm working with a bunch of large graphs, and stumbled across > something useful. Probably many of you know this, but I didn't and so > others might benefit. > > Using pch="." speeds up plotting considerably over using symbols. > > > x <- runif(1000000) > > y <- runif(1000000) > > system.time(plot(x, y, pch=".")) > user system elapsed > 1.042 0.030 1.077 > > system.time(plot(x, y)) > user system elapsed > 37.865 0.033 38.122 > > If you have enough points, the result is also more legible. > > Choice of which pch symbol makes a difference too, the default pch=1 being > the slowest of what I tried, but "." is by far the speediest. > > > system.time(plot(x, y, pch=0)) > user system elapsed > 11.191 0.011 11.270 > > system.time(plot(x, y, pch=1)) > user system elapsed > 38.024 0.008 38.245 > > system.time(plot(x, y, pch=2)) > user system elapsed > 14.140 0.027 14.270 > > system.time(plot(x, y, pch=3)) > user system elapsed > 15.696 0.011 15.799 > > system.time(plot(x, y, pch=4)) > user system elapsed > 18.770 0.007 18.888 > > This is a vanilla R session, 2.13.1 for x86_64-redhat-linux-gnu. I > haven't tried it on any other OS, but it's making my life a lot > smoother right now. > > Sarah > > -- > Sarah Goslee > http://www.functionaldiversity.org > > ______________________________________________ > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.
