replace duplicate value by 0 in matrix or vector

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Mira le
Mira le 2019-10-15
评论： Mira le 2019-10-21
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

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-10-15
编辑：Andrei Bobrov 2019-10-15
b = [1 2 1 3];
[a,c] = unique(b,'first');
out = zeros(size(b));
out(c) = a;

更多回答（2 个）

Adam
Adam 2019-10-15
[C,ia] = unique( b );
b( setdiff( 1:numel(b), ia ) ) = 0;
Jos (10584)
Jos (10584) 2019-10-15
% for small vectors:
b = [1 2 1 3 2 1 4 2]
b(sum(triu(b == b')) > 1) = 0

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