The author intenionally hide some info about the website's matlab code, since both of fomula and code calculate M4 with slightly different way, in Cody, you DO NOT NEED to minus the mean of P, unlike this website's code actually did that. I learned that in hard way, but deeply hope you guys enjoy to optimize this code.
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Back to basics 24 - Symbolic variables
Min of a Matrix
Sum the entries of each column of a matrix which satisfy a logical condition.
From a given cell array of strings, extract the non-unique strings.
Reassign cell contents to empty variables, preserving cell content data type
Replace all zeros and NaNs in a matrix with the string 'error'
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