Gradient of a scalar field.
Grad[f, {x1, …, xn}]
Grad[f, {x1, …, xn}, chart]
Grad[x^2 y, {x, y}]
→ {2*x*y, x^2}Grad[{x y, x + y}, {x, y}]
→ {{y, x}, {1, 1}}Grad[r Cos[t], {r, t}, "Polar"]
→ {Cos[t], -Sin[t]}Grad[r^2 z, {r, t, z}, "Cylindrical"]
→ {2*r*z, 0, r^2}