MATLAB: Using MATLAB determine the unit vector normal to ?=??+??−? at point P(1,3,0).

Question

using MATLAB determine the unit vector normal to ?=??+??−? at point P(1,3,0).

Answer 1

syms x y z
s = x^2+y^2-z;
n(x,y,z) = gradient(s, [x, y, z]);
a = eval(n(1,3,0)/norm(n(1,3,0)));