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).
convert matrix to single column
Area of a triangle
Remove the Zero
Back to basics 6 - Column Vector
Back to basics 7 - Equal NaNs
Back to basics 14 - Keywords
Back to basics 25 - Valid variable names
Back to basics 15 - classes
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