Replacing the numbers in a matrix

I have a matrix of numbers (22 x 22). Some of the numbers in the cells are zero. If the cell contains a zero, I want to replace in the numbers in the cells directly above, below, to the right and left also with a zero.

Answer 1

[Jan]

Do you mean all 8 surrounding elements?

x = randi([0,5], 22, 22);  % Example data
Z = conv2(double(x == 0), ones(3, 3), 'same');
x(Z ~= 0) = 0;

If you mean the 4 neighbors without the diagonals:

Z = conv2(double(x == 0), [0,1,0; 1,0,1; 0,1,0], 'same');
x(Z ~= 0) = 0;

[mcl1993]

I meant the 4 neighbours without the diagonals, thanks!

Answer 2

[Andrei Bobrov]

Let A - your array [22 x 22]

A(bwdist(A==0) <= 1) = 0