Re: [R] slowness of plot(x, type='l')

From: ronggui <0034058_at_fudan.edu.cn>
Date: Sat 07 May 2005 - 10:55:01 EST

On Fri, 06 May 2005 15:19:01 -0500
apjaworski@mmm.com wrote:

>
>
>
>
> A couple of days ago a few messages indicated that something changed in the
> basic plot routine that made plot(*, type='l') slow for large data sets.
> Some people even reported crashes for very large data sets. As far as I
> remember, this was not reported as a formal bug.
>
> I am still not sure if this is a bug, so I report my findings here. First
> of all, I think I see a slowdown of the plot function, although I do not
> have older versions of R installed, so I cannot do side-by-side
> comparisons. Secondly, I noticed that the behavior of plot(*, type='l')
> differs. Before R-2.1, the plotted lines would appear on the plot
> gradually. Now, after the wait, the whole plot appears at once.
>
> Here are my timing results. I am on Windows2000, IBM Intellistation with
> Xenon 2.8MHz with 1Gb of memory. I checked May-06 versions of R-patched
> and R-devel built from sources. I ran the following simple test:
>
> x <- rnorm(n)
> date(); plot(x, type='l'); date()
>
> Here are the timings:
>
> n seconds
> 5000 1
> 6000 2
> 7000 4
> 8000 6
> 9000 9
> 10000 13
> 12000 22
> 14000 36
> 20000 91



I have no such porblem,my OS is debian,256M ram and 2Gswap.

> x <- rnorm(200000)
> date(); plot(x, type='l'); date()
[1] "Sat May 7 08:49:18 2005"
[1] "Sat May 7 08:49:20 2005"
> version

         _
platform i386-pc-linux-gnu

arch     i386
os       linux-gnu

system i386, linux-gnu
status
major 2
minor 1.0
year 2005
month 04
day 18
language R

> It looks like only type='l' and type='o' exhibit this behavior. All other
> types produce plots in approximately 1 second. Also, the (long) wait and
> plot at once behavior happens with the two types mentioned. All others
> (except 'n' of course) produce gradually appearing plots.
>
> Hope this helps,
>
> Andy
>
> __________________________________
> Andy Jaworski
> 518-1-01
> Process Laboratory
> 3M Corporate Research Laboratory
> -----
> E-mail: apjaworski@mmm.com
> Tel: (651) 733-6092
> Fax: (651) 736-3122
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat May 07 10:58:39 2005

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