I have two 4x4 matrices. I sub-divided these matrices in 4 2x2 matrices each. Now I want to compare these 2x2 matrices.

Problem Explanation:

Matrix 1: Matrix 2:

8 7 6 9 0 1 0 1

11 13 4 21 1 0 1 0

2 69 33 27 0 1 0 1

5 3 1 8 1 0 1 0

I want to compare both these matrices but I want to consider a 2x2 sub matrix and compare.

For example:

8 7 compared with 0 1 ( 1st submatrix of matrix 2)

11 13 1 0

6 9 compared with 0 1 (2nd submatrix of matrix 2)

4 21 1 0

and perform the similar method with the other two blocks.

After I compare them I want to print the value of the first matrix which is matching with '1' of the second matrix.

For example:

8 7 compared with 0 1

11 13 1 0

I want to print '7' and '11' since they're matching with '1' and I want to perform the same thing with the other 3 blocks. How do I do it ? . Can you please provide the code for this. Thank you.

Answer 1

[Alan Stevens]

Something like this:

M1 = [8 7 6 9; 11 13 4 21; 2 69 33 27; 5 3 1 8];
M2 = [0 1 0 1; 1 0 1 0; 0 1 0 1; 1 0 1 0];

M = M1.*M2;

for i = 1:2:3
    for j = 1:2:3
    m = M(i:i+1, j:j+1);
    disp(m(abs(m)>0))
    end
end

    11
     7

     4
     9

     5
    69

     1
    27