MATLAB: How to find the submatrix of a matrix

Question

I'm new to Matlab so bear with me.

If I have a 2D matrix A and a submatrix B of A. How can I check if B is a submatrix of A?

I basically want to search for matrix B in A.

An example with code would be appreciated 🙂

Answer 1

Here is a simple for-loop that would work for 2D cases

A = magic(6) 
B = A(2:3,4:5) 
% engine
szA = size(A) ;
szB = size(B) ;
szS = szA - szB + 1 
tf = false(szA) ;
for r = 1:szS(1)
    for c = 1:szS(2)
        tf(r,c) = isequal(A(r:r+szB(1)-1,c:c+szB(2)-1),B) ;
    end
end
[rout,cout] = find(tf)