| """ | |
| ========================= | |
| 3D surface (checkerboard) | |
| ========================= | |
| Demonstrates plotting a 3D surface colored in a checkerboard pattern. | |
| """ | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| from matplotlib.ticker import LinearLocator | |
| ax = plt.figure().add_subplot(projection='3d') | |
| # Make data. | |
| X = np.arange(-5, 5, 0.25) | |
| xlen = len(X) | |
| Y = np.arange(-5, 5, 0.25) | |
| ylen = len(Y) | |
| X, Y = np.meshgrid(X, Y) | |
| R = np.sqrt(X**2 + Y**2) | |
| Z = np.sin(R) | |
| # Create an empty array of strings with the same shape as the meshgrid, and | |
| # populate it with two colors in a checkerboard pattern. | |
| colortuple = ('y', 'b') | |
| colors = np.empty(X.shape, dtype=str) | |
| for y in range(ylen): | |
| for x in range(xlen): | |
| colors[y, x] = colortuple[(x + y) % len(colortuple)] | |
| # Plot the surface with face colors taken from the array we made. | |
| surf = ax.plot_surface(X, Y, Z, facecolors=colors, linewidth=0) | |
| # Customize the z axis. | |
| ax.set_zlim(-1, 1) | |
| ax.zaxis.set_major_locator(LinearLocator(6)) | |
| plt.show() | |