Hi Virgilio,
Yes, it is possible to replace a specific value of a submatrix with a new value. For example, consider the matrix A as
A = [ NaN 2 6 6 10 11 NaN; 2 2 6 8 10 NaN NaN; 2 3 8 8 8 10 NaN; 2 6 8 8 10 11 NaN; NaN 2 11 11 11 2 2]
Now, a 5x2 submatrix of matrix A can be modified as follows to replace all occurrences of ‘2’ in this submatrix with ‘3’:
>> B = A(1:5,1:2); % select a 5x2 submatrix
>> B(B == 2) = 3; % find out all occurrences of ‘2’ in B and replace with ‘3’
>> A(1:5,1:2) = B; % write back the updated values to modify the original matrix
