meshgrid计算函数sqrt(x^2+y^2)

import numpy as nppoints=np.arange(-5,5,0.01)#1000个间隔相同的点xs,ys=np.meshgrid(points,points)#生成两个二维矩阵print(ys)import matplotlib.pyplot as pltz=np.sqrt(xs ** 2 + ys ** 2)#计算函数print(z)plt.imshow(z, cmap=plt.cm.gray);plt.colorbar()plt.title("Image plot of $\sqrt{x^2 + y^2}$ for a grid of values")