check if elements in an array are equal to 0 1 or 2

i have been given a random sqaure matrix. how do i check that all the elements witihin my array are equal to 0,1 or 2?

Answer 1

[Stephen23]

"how do i check that all the elements witihin my array are equal to 0,1 or 2? "

>> A = randi([0,2],4) % should pass
A =
   1   0   0   2
   1   2   0   2
   2   0   2   2
   1   1   1   1
>> all(ismember(A(:),0:2))
ans = 1
>> A = randi([0,9],4) % should fail
A =
   8   0   3   0
   6   6   3   6
   6   0   5   1
   4   2   1   1
>> all(ismember(A(:),0:2))
ans = 0

Answer 2

[madhan ravi]

a=randi([0 2],2)
unique(a(:))  %returns unique numbers in a matrix