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.
Omit columns averages from a matrix
Angle between two vectors
Multiply 2 numbers
Find the square of the sum of the digits of a number
Robust alignment of coordinate system
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Operate on matrices of unequal, yet similar, size
Wayfinding 3 - passed areas
Mmm! Multi-dimensional Matrix Multiplication
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