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    %% Determine Size of Variables  
% Determine the size of a variable, and then calculate the average of each
% column.   

%% 
% Open the example MAT-file, |stocks.mat|. 
filename = 'stocks.mat';
m = matfile(filename);  

%% 
% Determine the size of the variable, |stocks|, in |stocks.mat|. 
[nrows,ncols] = size(m,'stocks');  

%% 
% Compute the average of each column of the variable |stocks|. 
avgs = zeros(1,ncols);
for i = 1:ncols
    avgs(i) = mean(m.stocks(:,i));
end