Neighbors of a matrix

I want a way to write a code to find the neigbors of a 50 x 50 matrix

[Matt J]

Which is defined how?

[Walter Roberson]

Please expand on your question more. What form are you expecting the neighbors in ?

[the cyclist]

Suppose we use a smaller example, to understand your question. Here is a 5x5 matrix:

M = magic(5)

M = 5×5

17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9

What do you mean by "the neighbors"? What exactly would the input and output be for your problem?