J-G, thanks for the problem. Could you add some more information about expected inputs and outputs? An example and some more tests would be helpful too. If your test suite has exactly one test, it's trivial to write a correct answer.
Find the sum of the elements in the "second" diagonal
Who has power to do everything in this world?
Perfect Square or not
Find out sum of all elements of given Matrix
find the surface area of a cube
Number of problems
A SUBSREF variant that accepts the 'end'-operator.
Robust alignment of coordinate system
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Create a random logical vector of N elements of which M are true.
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