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.
