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.
does it touch ?
Bottles of beer
Back to basics 21 - Matrix replicating
Insert zeros into vector
From a given cell array of strings, extract the non-unique strings.
Replace all zeros and NaNs in a matrix with the string 'error'
Sum the entries of each column of a matrix which satisfy a logical condition.
Reassign cell contents to empty variables, preserving cell content data type
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