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    %% Union of Two Vectors and Their Indices  

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% Define two vectors with a value in common. 
A = [5 7 1]; 
B = [3 1 1];  

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% Find the union of vectors |A| and |B|, as well as the index vectors, |ia|
% and |ib|. 
[C,ia,ib] = union(A,B) 

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% The values in |C| are the combined values of |A(ia)| and |B(ib)|.