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    %% Summary of Categorical Vector  

%% 
% Create a 1-by-5 categorical vector. 
A = categorical({'plane' 'car' 'train' 'car' 'plane'}) 

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% |A| has three categories, |car|, |plane|, and |train|.  

%% 
% Print a summary of |A|. 
summary(A) 

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% |car| appears in two elements of |A|, |plane| appears in two elements,
% and |train| appears in one element. 

%%
% Since |A| is a row vector, |summary| lists the occurrences of each category
% horizontally.