[R] too long
Uwe Ligges
ligges at statistik.uni-dortmund.de
Fri Oct 31 12:03:10 CET 2003
william ritchie wrote:
> Hi everyone,
>
> I ve been using R for months and find it really
> practical and straight forward.
> However (the inevitable however), I am finding it very
> slow for one of my operations:
> it s basically an itertation over i and j in a pretty
> big table (4* 4608). It takes 30 minutes!!!!
>
> Thanks
You got at least 3 replies on your first message. Why do you post it
again???
Uwe Ligges
>
> Ps:if it can help here is the source:
>
> median1<-matrix(nrow=4608,ncol=1)
> median2<-matrix(nrow=4608,ncol=1)
> median3<-matrix(nrow=4608,ncol=1)
> median4<-matrix(nrow=4608,ncol=1)
> v<-c(18,19,20,21,23)
> for (i in 0:11)
> {
> for (j in 1:384)
> {
>
> median1[j+(i*384),]<-puce[j+(i*384),5]+median(puce[v+384*i,2]-puce[v+384*i,5])
>
> median2[j+(i*384),]<-puce[j+(i*384),19]+median(puce[v+384*i,16]-puce[v+384*i,19])
>
> median3[j+(i*384),]<-puce[j+(i*384),12]+median(puce[v+384*i,9]-puce[v+384*i,12])
>
> median4[j+(i*384),]<-puce[j+(i*384),26]+median(puce[v+384*i,23]-puce[v+384*i,26])
>
>
> puce[,5]<-median1
> puce[,19]<-median2
> puce[,12]<-median3
> puce[,26]<-median4
>
>
> }
> }
>
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