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%% Reduce Memory Requirements % This example shows how to compare the memory required to store data as % a cell array of character vectors versus a categorical array. Categorical arrays % have categories that are defined as character vectors, which can be costly to store % and manipulate in a cell array of character vectors or |char| array. Categorical % arrays store only one copy of each category name, often reducing the amount % of memory required to store the array. %% % Create a sample cell array of character vectors. state = [repmat({'MA'},25,1);repmat({'NY'},25,1);... repmat({'CA'},50,1);... repmat({'MA'},25,1);repmat({'NY'},25,1)]; %% % Display information about the variable |state|. whos state %% % The variable |state| is a cell array of character vectors requiring 17,400 bytes % of memory. %% % Convert |state| to a categorical array. state = categorical(state); %% % Display the discrete categories in the variable |state|. categories(state) %% % |state| contains 150 elements, but only three distinct categories. %% % Display information about the variable |state|. whos state %% % There is a significant reduction in the memory required to store the variable.