Hi Nicolas,

Try (untested):

with(pop, table(factor(xloc, levels = 1:20), factor(loc, levels = 1:25)))

HTH,
Jorge


On Wed, Sep 15, 2010 at 7:31 PM, Nicolas Gutierrez <> wrote:

> Hi All,
>
> I’m trying to superimpose (or "add")  two matrices:
>
> 1. resulting from a table function with frequencies:
>
> > U=table(pop$xloc, pop$yloc))
>
>      14 15 16 17 18 19 20 21 22
>  5   0  0  0  0  0  0  0  0  0
>  7   0  0  0  0  0  0  0  0  0
>  8   0  0  0  0  0  0  0  0  0
>  9   0  0  0  0  0  0  9  0  5
>  10  0  0  0  0  0  0  0  0  0
>  11  0  0  0  0  0  0  0  0  0
>
> 2. The second created to match my spatial grid (20x25):
>
> > Uempty=matrix(data = 0, nrow = 20, ncol = 25)
>
> I want to place each element of U (e.g. U[22,9]=5) in the corresponding
> cell of Uempty and end up with this final matrix like this:
>
>      1  2  3 ...  22 23 24 25
>  5   0  0  0  ...  0  0  0  0
>  :   :  :  :  ...  :  :  :  :
>  7   0  0  0  ...  0  0  0  0
>  8   0  0  0  ...  0  0  0  0
>  9   0  0  0  ...  5  0  0  0
>  :   :  :  :  ...  :  :  :  :
>  20  0  0  0  ...  0  0  0  0
>
> Any ideas?
>
> Thanks!!!
>
> Nico
>
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