Laura Holt wrote:

> Hi R!
>
> I have a 3 dimensional array, which is 21 x 3 x 3
>
> I want to use apply to sum on each 21x3 matrix, which is fine.
>
> Is there a way that I can do this in 1 step instead of a loop (3), please?

Don't know which direction you mean, I guess one of the following:

apply(x, c(1,2), sum)
apply(x, 3, sum)

Uwe Ligges


> thanks,
> Laura Holt
> mailto: holtlaura@(protected)
>
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