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).
Column norms of a matrix
Back to basics 24 - Symbolic variables
Getting the row and column location from a matrix
select the primes of a vector
Back to basics 25 - Valid variable names
Back to basics 18 - justification
Back to basics 17 - white space
Back to basics 2 - Function Path
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