MATLAB: Replace duplicate value by 0 in matrix or vector

Question

How do we replace duplicate value by 0 in matrix or vector ?

for example

Input:

b = 1 2 1 3

Output::

b= 1 2 0 3

Thanks

Answer 1

 b = [1 2 1 3];
 
 [a,c] = unique(b,'first');
 out = zeros(size(b));
 out(c) = a;