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.
A major part of the article including the code is not accessible to non-members of the website.
Add two numbers
Check to see if a Sudoku Puzzle is Solved
Create a cell array out of a struct
Back to basics 26 - Keywords
Remove white space from the 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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