| """ | |
| ================ | |
| Parametric curve | |
| ================ | |
| This example demonstrates plotting a parametric curve in 3D. | |
| """ | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| ax = plt.figure().add_subplot(projection='3d') | |
| # Prepare arrays x, y, z | |
| theta = np.linspace(-4 * np.pi, 4 * np.pi, 100) | |
| z = np.linspace(-2, 2, 100) | |
| r = z**2 + 1 | |
| x = r * np.sin(theta) | |
| y = r * np.cos(theta) | |
| ax.plot(x, y, z, label='parametric curve') | |
| ax.legend() | |
| plt.show() | |