matplotlib 画 3d 图像

import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

fig = plt.figure()
ax = Axes3D(fig)
x = np.arange(-4,4,0.25)
y = np.arange(-4,4,0.25)
x,y = np.meshgrid(x,y) 
B = x ** 2 - 10 * np.cos(2 * np.pi * x) + 10
R = y ** 2 - 10 * np.cos(2 * np.pi * y) + 10
Z = B + R
ax.plot_surface(x,y,Z,rstride=1,cstride=1,cmap=plt.get_cmap('rainbow'))
plt.show()