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Calculate an image mean withouth the "mean" command

Hi at all,
first, sorry for the bad english...
i have to calculate the mean of an image without using the command "mean".
with mean i resolve in this way:


%mask 5x5
for i=1:M-4
      for j=1:N-4
            c = a(i : i+4 , j : j+4);
            media5(i,j)=mean( c ( : ) );

the teacher says that shoul be used more for-cycle, but i have no idea about how implement it.

Thanks in advance

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