MATLAB: How to calculate a cumulative sum in a loop

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I have a loop that looks like this:
for a = 1: 9
    for b = 1 : 1000
        for c = 1 : 1000
            image = myimage_bands(b, c, a);
            new_image = image * 5;
        end   
    end
end
I am trying to find the cumulative sum of my variable 'new_image', as it goes through the loop. I've tried cumsum, but it doesn't work.
Any ideas are appreciated. Thanks!

Best Answer

Before the loop,
image_sum = [];
inside the loop after you have calculated new_image,
if isempty(image_sum)
  image_sum = new_image;
else
  image_sum(end+1) = image_sum(end) + new_image;
end
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