How can I create a variable changing with index number?

2013 11 16
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how can I create a variable N such that it's value changing with the index and then do the summation, i.e:
∑_Ni from i=0 to i=255 ,
where Ni is the number of pixels that have intensity value Ri
For knowledge, I have an image with its histogram.

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Image Analyst
Image Analyst 2013-11-16

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You can do
i = 0:255;
though you don't need to do that to take the sum. To sum the histogram of the image you can do
[pixelCounts, grayLevels] = imhist(grayscaleImage);
theSum = sum(pixelCounts(:));

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