You need: system.time(print(qplot(x,y,pch=I('.'))))
Hadley
On Fri, Nov 18, 2011 at 1:30 PM, Justin Haynes <jto...@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.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
>>
>> ______________________________________________
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>> 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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