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    %% List Categories in Categorical Array  

%% 
% Create a categorical array, |A|. 
A = categorical({'plane' 'car' 'train' 'car' 'plane'}) 

%%
% |A| is a 1-by-5 categorical array.  

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

%%
% Since you created |A| by specifying only an input array, the categories
% appear in alphabetical order.