[R] Ways to speed up R code?

ecoinfo ecoinformatics at gmail.com
Tue Oct 18 13:14:18 CEST 2005


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 Schönhoff <tschoenhoff at gmail.com> wrote:
> Hello,
>
>
> 2005/10/18, ecoinfo <ecoinformatics at 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
>
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