The ne(M1,M2) command tests if the elements of M1 and M2 are not equal.  The result is an integer array with 1's where M1[i] is not equal to M2[i], and 0's where the entries are equal.

M1 and M2 must be the same size, or scalars.  If M1 is an array and M2 is a scalar, the result will be an array the same size as M1, with 0 and 1 entries indicating entries that were not equal to the scalar value M2.