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    %% Add Categories at End  

%% 
% Create a nonordinal categorical array. 
A = categorical({'republican' 'democrat' 'republican';...
    'democrat' 'republican' 'democrat'})  

%% 
% Display the categories of |A|. 
categories(A) 

%%
% |A| is a 2-by-3 categorical array with two categories.  

%% 
% Add the categories, |independent| and |undeclared|, to the end of the
% category list. 
B = addcats(A,{'independent' 'undeclared'}) 

%%
% |B| contains the same values as |A|.  

%% 
% Display the categories of |B|. 
categories(B) 

%%
% |B| is a 2-by-3 categorical array with four categories.