On Fri, May 27, 2011 at 10:06 AM, marco milella <vru...@gmail.com> wrote:
> Hi to everybody
> I have an array with dimensions 2,4,3,3.
> Wanting to sum the matrices in the first two dimensions, I'm trying to use
> the "apply" function, but with no results. Have to say I'm quite new with R
> syntax.
Tell apply() which dimensions you want to keep, in this case 3 and 4
R> m<-array(1, dim=c(2,4,3,3))
R> apply(m,3:4,sum)
[,1] [,2] [,3]
[1,] 8 8 8
[2,] 8 8 8
[3,] 8 8 8
-thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
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