[R] newbie question: ROW average

[Gabor Grothendieck]

Try this:

   rowsum(mat, gl(nrow(mat)/4, 4)) / 4

On 5/29/06, A Ezhil <ezhil02 at yahoo.com> wrote:
> Hi,
>
> I am new to R programming. I have a 992 x 74 matrix. I
> would like to form a new matrix by averging each 4
> rows
> from the original one. How can I use 'apply' instead
> of usual mean inside the nested for loop?
>
> Thanks in advance.
>
> regards,
> ezhil
>
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