[R] Ways to speed up R code?

[ecoinfo]

Sorry for my poor English. One sentence in my last emails should be
"Furthermore, I need a general instruction (e.g. Patrick's book and
Duncan's rules) instead of pieces". Hope I was not misunderstood.

Thanks for Patrick and Duncan's useful replies.
Xiaohua

On 10/18/05, ecoinfo <ecoinformatics at 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 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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>