%% Union of Two Vectors and Their Indices
% Define two vectors with a value in common.

A = [5 7 1]; 
B = [3 1 1];

%
% Find the union of vectors A and B, as well as the index vectors, ia and ib.

[C,ia,ib] = union(A,B)

% The values in C are the combined values of A(ia) and B(ib).
% Copyright 2012 The MathWorks, Inc.