[R] Ways to speed up R code?

[Patrick Burns]

What might be most likely for misunderstanding is "Patrick's book"
since my message was private.  The book is S Poetry.

Patrick Burns
patrick at burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")

ecoinfo wrote:

>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
>>>
>>>______________________________________________
>>>R-help at stat.math.ethz.ch mailing list
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>>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>>>
>>>      
>>>
>
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>  
>