()
| 14 | |
| 15 | |
| 16 | def swirl_velocity_field(): |
| 17 | x = np.linspace(-3., 3., 200) |
| 18 | y = np.linspace(-3., 3., 100) |
| 19 | X, Y = np.meshgrid(x, y) |
| 20 | a = 0.1 |
| 21 | U = np.cos(a) * (-Y) - np.sin(a) * X |
| 22 | V = np.sin(a) * (-Y) + np.cos(a) * X |
| 23 | return x, y, U, V |
| 24 | |
| 25 | |
| 26 | @image_comparison(['streamplot_startpoints.png'], remove_text=True, style='mpl20', |
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