The test suite already spoils the solution.
True. In general that should be avoided, although admittedly it's difficult here because if the correct answer were hard-coded, then changes to: (i) the hardware on which Cody runs; or (ii) the version of MATLAB that Cody employs may eventually invalidate it. Having said that, the Test Suite could still be tightened up (see e.g. Solution 1461085).
Return the 3n+1 sequence for n
Angle between two vectors
Getting the row and column location from a matrix
Matrix which contains the values of an other matrix A at the given locations.
Back to basics 22 - Rotate a matrix
2 b | ~ 2 b
Back to basics 19 - character types
Back to basics 13 - Input variables
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