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.
Find state names that end with the letter A
Equidistant numbers containing certain value in an interval
Use of regexp
03 - Matrix Variables 3
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.
From a given cell array of strings, extract the non-unique strings.
Reassign cell contents to empty variables, preserving cell content data type
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