How to detect and delete similar value rows in Matlab?

Let's say I have an 4x4 matrix with values [1 to 4]:

[1 2 3 4;

1 3 4 2;

1 4 2 4;

1 3 2 2]

As you can see the first column contains 4 of the same values [1]. How can I detect rows/columns containing 4 of the same values and replace them by a value [0]?

Thanks in advance.

Answer 1

[Chunru]

A =[1 2 3 4;
    1 3 4 2;
    1 4 2 4;
    1 3 2 2];
% For columns with the same values
i = find(all(diff(A, 1)==0, 1));   % 1 for 1st dimension;  use 2 for 2nd dimension
A(:, i) =0

A = 4×4

0 2 3 4 0 3 4 2 0 4 2 4 0 3 2 2