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.
Vectorize the digits of an Integer
Find out missing number from a vector of 9 elements
Volume of a box
Divide by 4
A SUBSREF variant that accepts the 'end'-operator.
Mmm! Multi-dimensional Matrix Multiplication
Convert nested struct-array to numeric array
Number of problems
Make a KITT-scanner on the command line
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