For , the gradient is normal to elliptical level sets. With step size 0.2, each update multiplies the horizontal coordinate by 0.8 and the vertical coordinate by 0.2, approaching the minimum.对于 ，梯度垂直于椭圆形等高线。步长取 0.2 时，每次更新将横坐标乘以 0.8、纵坐标乘以 0.2，逐渐接近最小值点。
The dots are actual iterates from . Their curved path reflects unequal curvature along the two axes; connecting segments indicate updates, not a continuous physical trajectory.光点是从 出发的真实迭代点。路径弯曲源于两个方向的曲率不同；连接线表示离散更新，不是连续的物理运动轨迹。