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    %% Determine Whether Matrix Contains All Real Values  

%% 
% Define a 3-by-4 matrix, |A|. 
A = [7 3+4i 2 5i;...
     2i 1+3i 12 345;...
     52 108 78 3];  

%% 
% Determine whether the array is real. 
tf = isreal(A) 

%%
% Since |A| contains complex elements, |isreal| returns false.