From: ecoinfo <ecoinformatics_at_gmail.com>

Date: Tue 18 Oct 2005 - 21:19:41 EST

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 Tue Oct 18 21:24:53 2005

Date: Tue 18 Oct 2005 - 21:19:41 EST

Thanks for Patrick and Duncan's useful replies. Xiaohua

On 10/18/05, ecoinfo <ecoinformatics@gmail.com> wrote:

> RSiteSearch("speed up R code")

*> == search for a page having the words (speed, up, R, and code)
**> surely R is found everywhere.
**> Although there are some useful archives, many of them are not.
**> Furthermore, I need a general instruction instead of pieces (e.g.
**> Patrick's book and Duncan's rules)
**>
**> If I use "speed up R code" as a phrase, then only one not-very-useful hit.
**>
**> Thanks,
**> Xiaohua
**>
**>
**>
**> On 10/18/05, Thomas Schönhoff <tschoenhoff@gmail.com> wrote:
**> > Hello,
**> >
**> >
**> > 2005/10/18, ecoinfo <ecoinformatics@gmail.com>:
**> > > Hi R-users:
**> > >
**> > > Yesterday I ran a R code for 9 hours and it did not show any sign to
**> > > stop. Then I interrupted it and found it had completed 82.5%.
**> > >
**> > > This morning I decided to wait for another 11 hours to see what will
**> > > happen. Wait a minute, I heard that transforming data.frame to matrix
**> > > will make R code faster. Then I made the modification in my R code.
**> > > Oooh, the new code finished within 30 minutes!!
**> > >
**> > > Are there any other tips to speed up R program? Or someone could
**> > > indicate me some documents or websites on R code optimization?
**> > >
**> > > #OS: Win XP, CPU: Pentium IV, 3.20G, Memory: 1G
**> > > #for() loop: 1000*1616*3*41, 3 data.frames (dim = c(1616,5), c(1616),
**> > > c(1616) respectively)
**> > >
**> >
**> > RSiteSearch("speed up R code") gives 346 hits, so this problem has
**> > been discussed on this list some time before. Maybe something worth to
**> > pay attention to?
**> >
**> >
**> > regards
**> > Thomas
**> >
**> > ______________________________________________
**> > 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
**> >
**>
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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 Tue Oct 18 21:24:53 2005

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