That is a function I did not know about, thanks Hadley!

I still don't see the speed increase that you do with the base plot
package, but I'm sticking with ggplot anyway!

> x<-runif(1e6)
> y<-runif(1e6)
> system.time(print(qplot(x,y)))
   user  system elapsed
 42.234   0.520  43.061
> system.time(print(qplot(x,y,pch=I('.'))))
   user  system elapsed
 32.370   0.204  33.868


On Fri, Nov 18, 2011 at 12:39 PM, Hadley Wickham <hadley@rice.edu> wrote:

> You need: system.time(print(qplot(x,y,pch=I('.'))))
>
> Hadley
>
> On Fri, Nov 18, 2011 at 1:30 PM, Justin Haynes <jtor14@gmail.com> wrote:
> > 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.goslee@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.
> >
>
>
>
> --
> Assistant Professor / Dobelman Family Junior Chair
> Department of Statistics / Rice University
> http://had.co.nz/
>

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