MATLAB: Can someone please explain this code for me

Question

for i=1:ni
    for j=1:nj
        for k=1:nj
            cc(i,j) = cc(i,j)+aa(i,k)*bb(k,j);
        end
    end
end

Answer 1

It is code for matrix multiplication of two matrices aa (dimensions ni*nj) and bb (dimensions nj*nj). Read here: https://en.wikipedia.org/wiki/Matrix_multiplication. Equivalent MATLAB command is

cc = aa*bb