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    %% Remove Categories and Make Corresponding Values Undefined  

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% Create a categorical array, |A|, containing modes of transportation. 
A = categorical({'plane' 'car'; 'train' 'car'; 'plane' 'car'}) 

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

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

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

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% Remove the category, |train|. 
B = removecats(A,'train') 

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% The element that was from the category |train| is now undefined.  

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

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% |B| has one fewer category than |A|.