is there any source codes available for entropy encoding for images, please help
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If you've heard of it, then I'm sure there are.
If x is a numeric array, TABLE is a numeric matrix. If the elements of x are nonnegative integers, TABLE includes 0 counts for integers between 1 and max(x) that do not appear in x.
But you already read the documentation so you already knew that, so somehow you must have gotten some negative counts. What does
count(counts <= 0)
show, and what does class(count) show?