MATLAB: Curl with symbolic vector

curlcurl symbolic vectorMATLAB

I'm trying to do use curl with a symbolic vector, but it just keeps on returing a zero vector. 
% ∇ × F
syms Fx Fy Fz x y z
curl( [Fx, Fy, Fz], [x, y, z] );
> [ 0; 0; 0 ]
According to this accepted answer it should work just fine, so why isn't it?

Best Answer

The answer defined in this way:
syms Fx(x,y,z) Fy(x,y,z) Fz(x,y,z)
curl([Fx Fy,Fz],[x, y, z])
Result:
ans(x, y, z) =
 diff(Fz(x, y, z), y) - diff(Fy(x, y, z), z)
 diff(Fx(x, y, z), z) - diff(Fz(x, y, z), x)
 diff(Fy(x, y, z), x) - diff(Fx(x, y, z), y)
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