A problem must detail what needs to be done in its description. There is not only one way to do what's requested. You should probably add more test cases too, at least 5, to avoid lookup table solutions.
The Hitchhiker's Guide to MATLAB
Create an n-by-n null matrix and fill with ones certain positions
The sum of the numbers in the vector
Skip by a multiple
Write a code that will follow the equation y = x * (x + x) * x.
matrix rows and columns
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