Excellent problem!!! Cody is a great for getting acquainted with Matlab features I have never used.
It seems that the first case of the test suite is still being called which generates an error and makes impossible to solve the problem without hacks. The polyval function's complexity currently is 22, not 19. Please remove the test case (which will not render previous solutions false) or update its value.
The troublesome first line in the test suite has been commented out and old solutions re-scored.
Notice that althought there are only 4 test cases bellow (allegedly), my solution considering all five cases and a lookup table works. Please, fix your test suite, and this solution will become false.
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