[R] Odp: Efficient nested loops

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 21.10.2010 10:40:40:

> Dear R community,
> 
> I am working with huge arrays, so I spend a lot of time computing. This 
is
> my code:
> 
> for (x in 1:dim(variable)[1]){
>     for (y in 1:dim(variable)[2]){
>         for (z in 1:dim(variable)[3]){
>             result <- max(variable[x,y,z,])
>         }
>     }
> }
> 
> Is there a more efficient procedure to do this task?

is this what you are looking for?

ar<-array(rnorm(24),c(4,3,2))
apply(ar, 3, max)

Regards
Petr


> 
> Thanks in advance!
> 
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> 
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