I think you should change "assert(isequal(your_fcn_name(x),y_correct))
" to "assert(isequal(your_fcn_name(n),y_correct))"
I made the suggested change to the test suite and re-scored.
I believe there is some tricky code in the test suite that has to be overcome by hacking the Cody Scoring server, and execute a function your_fcn_name before it is even called. Or a mechanism to change all x's in n's.
Rotate a Matrix by 90 degrees
Replace multiples of 5 with NaN
Evaluating a polynomial
Divisible by 2
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