MATLAB: Centre of a matrix

Question

Assume that have a matrix of the form :

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

And I want to get the centre of, in this case, small matrix inside the big matrix consisting of only 0s ( 2×3 in this case ). Can I write the function that would do it for me ? Thanks.

Answer 1

A = [0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 4 5 6 7 1 2 0 0
0 0 2 0 0 0 3 8 0 0
0 0 4 0 0 0 7 6 0 0
0 0 4 5 7 5 8 5 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0];
out = A(any(A,2),any(A));
out = out(~all(out,2),~all(out));

or

t = bwlabel(~A);
t = max(t(:)) == t;
out = A(any(t,2),any(t));