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.
Filter AC, pass DC
Inner product of two vectors
Remove the two elements next to NaN value
Area of rhombus
Add two numbers
Wayfinding 1 - crossing
Wrap a vector, but insert NaN's at the wrap-positions.
Order of things - 3
Operate on matrices of unequal, yet similar, size
Wayfinding 4 - Crossing, level 2
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