[R] help

[Sarah Goslee]

If your matrices are the same size, you can just add them. If they aren't the
same size, I'm not sure what you are trying to accomplish.

> mat1 <- matrix(1:9, nrow=3)
> mat1
     [,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9
> mat2 <- matrix(runif(9), nrow=3)
> mat2
           [,1]      [,2]      [,3]
[1,] 0.54837515 0.3476839 0.6298484
[2,] 0.25790633 0.3394281 0.3601670
[3,] 0.08251705 0.2288201 0.4216952
>
> mat1 + mat2
         [,1]     [,2]     [,3]
[1,] 1.548375 4.347684 7.629848
[2,] 2.257906 5.339428 8.360167
[3,] 3.082517 6.228820 9.421695



On Thu, May 21, 2009 at 11:08 AM, daniele riggi <daniele.riggi at 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
>
>


-- 
Sarah Goslee
http://www.functionaldiversity.org