[R] Summing over an index of an array
Moshe Olshansky
m_olshansky at yahoo.com
Wed Feb 20 22:39:07 CET 2008
Try
apply(A,2:3,sum)
--- Saurav Pathak <saurav at sas.upenn.edu> wrote:
> Hi,
>
> I cannot seem to figure out how to sum over an index
> of a array.
> For example, let A be a 3 dimensional array. I want
> to, say, find
> the sum over the first dimension. That is
>
> S_jk = Sum_i A_ijk
>
> where now S is a 2-dim matrix. I dont want to use a
> loop.
>
> Thanks,
> --
> saurav
>
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