[R] How to speed up the for loop by releasing memeory

[Patrick Burns]

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You are wise to want to leave.

http://www.burns-stat.com/pages/Tutor/R_inferno.pdf

Pat


On 15/12/2012 15:10, Yong Wang wrote:
> Dear list;
>
> How can I speed up the run of following code (illustrative)
> #========================================================================
> con<-vector("numeric")
>
> for (i in 1:limit)
> {
> if(matched data for the ith item found) {
>              if(i==1) {con<-RowOfMatchedData } else
> {con<-rbind(con,matchedData)}
>                                                          }
> }
> #========================================================================
>
> each RowOfMatchedData contains 105 variables, when "i" runs over 10^7
> and the data container "con" get large enough, the codes get extremely
> slow, I know this is a working memory problem (2GB only), is there
> anyway to circumvent this problem without dicing and slicing the data.
>
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>

-- 
Patrick Burns
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twitter: @portfolioprobe
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and 'The R Inferno')