use x and y · functions: sin, cos, sqrt, exp, log, abs · constants: pi, e · ^ for power, * for multiply
contour map
Gradient Descent · −∇f
ball (x, y, z) = —
∇f = ⟨—⟩
|∇f| = —
step # 0
Click "Drop" or click the surface to place the ball.
ball rolling downhill
−∇f direction (where it will go)
surface height (blue low → gold high)
drag to rotate · click surface to place ball