[R] Ways to speed up R code?

[ecoinfo]

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)

Thanks in advance,
Xiaohua

--
Xiaohua Dai, Dr.
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* Postdoctoral in elephant-tree ecosystem simulation
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Centre for Systems Research, Durban Institute of Technology
P.O.Box 953, Durban 4000, South Africa
Tel: +27-31-2042737(O) Fax: +27-31-2042736(O)
Mobile: +27-723682954
Publications: http://www.getcited.org/?MBR=11061629