average column data from multiple files

example

in file a, data is [1 , 2, 3; 4,5,6]

file b, data is  [4,5, 6; 7,8,9]

average=0.5 (a+b)

matlab code

n=;
a=[];
b=[];
c=[];
% for loop
for i=:n
    filename=sprintf('output_%d.dat',i);
    fileinfo = importdata(filename);
    ux=fileinfo.data(:,);   % extract column data
    uy=fileinfo.data(:,);
    uz=fileinfo.data(:,);
    a=[a,ux];   % put all Ux in an array
    b=[b,uy];
    c=[c,uz];

end
aver_Ux=sum(a,)/n;  % sum of array elements
aver_Uy=sum(b,)/n;

aver_Uz=sum(c,)/n;