replace duplicate value by 0 in matrix or vector

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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

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 15 Oct 2019
Edited: Andrei Bobrov on 15 Oct 2019
b = [1 2 1 3];
[a,c] = unique(b,'first');
out = zeros(size(b));
out(c) = a;

More Answers (2)

Adam
Adam on 15 Oct 2019
[C,ia] = unique( b );
b( setdiff( 1:numel(b), ia ) ) = 0;

Jos (10584)
Jos (10584) on 15 Oct 2019
% for small vectors:
b = [1 2 1 3 2 1 4 2]
b(sum(triu(b == b')) > 1) = 0

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