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.
Arrange vector in ascending order
Make a run-length companion vector
Calculate the height of an object dropped from the sky
Create matrix of replicated elements
Order of things - 1
Wrap a vector, but insert NaN's at the wrap-positions.
Insert certain elements into a vector.
Order of things - 3
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
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