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.
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Convert String to Morse Code
Back to basics 24 - Symbolic variables
Number of 1s in a binary string
Reassign cell contents to empty variables, preserving cell content data type
From a given cell array of strings, extract the non-unique strings.
Sum the entries of each column of a matrix which satisfy a logical condition.
Replace all zeros and NaNs in a matrix with the string 'error'
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