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    %% Union of Rows in Two Matrices  

%% 
% Define two matrices with a row in common. 
A = [2 2 2; 0 0 1];
B = [1 2 3; 2 2 2; 2 2 2];  

%% 
% Find the combined rows of |A| and |B|, with no repetition, as well as
% the index vectors |ia| and |ib|. 
[C,ia,ib] = union(A,B,'rows') 

%%
% The rows of |C| are the combined rows of |A(ia,:)| and |B(ib,:)|.