extract cells by columns/rows from matrix

Hi All,

I have the following matrix Ufi (x by y):

Ufin

1 2 3 4 5 6 7 8 9 10
   1  0 0 0 0 0 0 0 0 0  0
   2  0 0 0 0 0 0 0 0 0  0
   3  0 0 0 0 0 0 0 0 0  0
   4  0 0 0 6 0 0 0 0 0  0
   5  0 0 0 0 0 0 0 0 0  0
   6  0 0 0 0 0 0 9 0 0  0
   7  0 2 0 0 0 0 0 0 0  0
   8  0 0 0 0 0 0 0 0 0  0
   9  0 0 0 0 0 0 0 1 0  0
   10 0 0 0 0 0 0 0 0 0  0

And I need to extract the values for x and for y of those cells with maximum values:

First would be:

x=7; y=6

Second:

x=4; y=4

And so on... Any help?

Thanks!

Nic