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.
Remove any row in which a NaN appears
Sum of diagonal of a square matrix
Insert zeros into vector
Swap two numbers
Matlab Basics - Set unwanted parts of a vector to zero
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