Dear Daniele,
Try this:

A <- matrix(1:10,ncol=2)
B <- matrix(10:20,ncol=2)
A+B
#[,1] [,2]
#[1,]   11   21
#[2,]   13   23
#[3,]   15   25
#[4,]   17   27
#[5,]   19   29

HTH,

Jorge


On Thu, May 21, 2009 at 11:11 AM, daniele riggi <daniele.riggi@gmail.com>wrote:

> Someone knows the existence of a function to sum the elements of the same
> place A[i,j] B[i,j] of a matrix?thank you
>
>
> --
> Dr. Daniele Riggi, PhD student
> University of Milano-Bicocca
> Department of Statistics
> Building U7, Via Bicocca degli Arcimboldi, 8
> 20126 Milano, Italy
> cell. +39 328 3380690
> mailto: daniele.riggi@gmail.com
>
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