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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