Re: [R] how to reshape an array avoiding for loops

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Wed 17 Aug 2005 - 07:18:27 EST

Wladimir Eremeev <wl@eimb.ru> writes:

> Dear r-help,
>
> I have an array a1 with dimensions [1:660,1:65,1:25]
> I would like the first dimension to be the last one.
> That is I want and array [1:65,1:25,1:660]
>
> The only way to do this, I know, is
>
> tmp.a<-array(dim=dim(a1)[c(2,3,1)])
> for(i in 1:dim(a1)[1]) tmp.a[,,i]<-a1[i,,]
> a1<-tmp.a
> rm(tmp.a)
>
>
> Is it possible to avoid 'for' loop here?

aperm() is your friend.

-- 
   O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Wed Aug 17 07:28:22 2005

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