aplly to matrix a probability distribution for submatrix

Hello ! I would apply to my matrix , a generical probability distribution (such as normal) for submatrix IXJ ( i = j ) (for example, 4x4 or 3x3) . I'm attaching a picture to explane better my problem. how can I write this code? thanks

Answer 1

[Mohammad Abouali]

It appears for your case, if your kernel (or probability distribution) is symmetric you can use both conv2() or xcorr2(). If it is not symmetric you should use xcorr2)