Problem 1961. Finding neighbors of [-1:1] in a matrix....

Hello All!

Well I found this one fun to figure out, all you have to do is make a matrix of 1's or 0's (true or false) that show whether or not a number in a matrix is sitting directly next to (a neighbor) that is number that is +1 or -1 or == to that of the original number. Here are some examples:

M1 = [1 2 1;
      5 6 7;
      2 3 6]

SO now find numbers next to one another that are +1 of each-other.

output = [1 1 1;
          1 1 1;
          1 1 1]
One more:

M2 = [8 8 8;
      4 4 4;
      1 9 7]

SO now find numbers next to one another that are +1 of each-other.

output = [1 1 1;
          1 1 1;
          0 0 0]

One more:

M3 = [1  8   5;
      4  10  22;
      1  66  7]

SO now find numbers next to one another that are +1 of each-other.

output = [0 0 0;
          0 0 0;
          0 0 0]

Well good luck!