I have defined a function
f[x_, y_, z_] := x*y^2 - y *z^2
and I want to evaluate its gradient at the point (0,-2,1)
I tried Grad[f[x,y,z], {0,-2,1}]
and that just gave me back the function with a nabla in front of it.
I tried Grad[f[0, -2, 1], {x, y, z}]
. That of course gives zero because x
,y
and z
are constant, right?