Message-ID: <x28xz1mvh8.fsf@turmalin.kubism.ku.dk>
Date: 2005-08-16T21:18:27Z
From: Peter Dalgaard
Subject: how to reshape an array avoiding for loops
In-Reply-To: <171836925.20050816131204@eimb.ru>
Wladimir Eremeev <wl at 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.
--
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