This test suite does not work. This problem uses 'sphere' as the function handle, but MATLAB already has a sphere function. This means whenever the test suite runs the code entered by the user is never touched, MATLAB runs its own sphere function on the input given, which return matrices representing a unit sphere. This test suite must be changed for this problem to be solvable.

Has anyone solved this Problem ? it Looks like some error in test suits.
even if you copy the y, z values from test suit and make straight Forward answer without any logic, still it Fails.

This problem is now solvable. The error came in the function being named sphere(), as that is already a built-in function Matlab.