How can I compact a matrix to a define size?

I'm trying to build a compact array. I have a array 8192x8192 and I want to make it for 1024 x 1024. See the code:

 MC = zeros(8192/8);

   for i= 1:8192/8
       for j=1:8192/8
          for m=1:8
             for n = 1:8
                MC(i,j) = MC(i,j) + M(i+m-1;j+n-1) % Size M = 8192X8192
             end
          end
       end
    end

Answer 1

[KSSV]

A = rand( 8192,8192) ;
B = imresize(A,[1024 1024]) ;

Read about imresize, interp2.

[Daniel Fonsêca]

That array has informations. Wnen I use resize or imresize, when i plot M, the result isn't the expected.

[Daniel Fonsêca]

Thanks by the answer. I had made the array wrong, so the result was wrong. When i fixed it, the imresize worked.