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    %% Express Array Elements as Ratios  

%% 
% Create a 4-by-4 matrix. 
format short;
X = hilb(4)  

%% 
% Express the elements of |X| as ratios of small integers using |rat|. 
[N,D] = rat(X) 

%%
% The two matrices, |N| and |D|, approximate |X| with |N./D|.  

%% 
% View the elements of |X| as ratios using |format rat|. 
format rat
X 

%%
% In this form, it is clear that |N| contains the numerators of each
% fraction and |D| contains the denominators.