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.
Back to basics 6 - Column Vector
Who knows the last digit of pi?
Sum of diagonal of a square matrix
Convert from Base 10 to base 5
Find the index of n in magic(n)
Return 'on' or 'off'
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
Insert certain elements into a vector.
Only once: cleaning up your columns
Robust alignment of coordinate system
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