matplotlib/plot_types/arrays/streamplot.py at pre-commit · ianhi/matplotlib · GitHub

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"""

======================

streamplot(X, Y, U, V)

======================

See `~matplotlib.axes.Axes.streamplot`.

"""

import matplotlib.pyplot as plt

import numpy as np

plt.style.use('_mpl-gallery-nogrid')

# make a stream function:

X, Y = np.meshgrid(np.linspace(-3, 3, 256), np.linspace(-3, 3, 256))

Z = (1 - X/2 + X**5 + Y**3) * np.exp(-X**2 - Y**2)

# make U and V out of the streamfunction:

V = np.diff(Z[1:, :], axis=1)

U = -np.diff(Z[:, 1:], axis=0)

# plot:

fig, ax = plt.subplots()

ax.streamplot(X[1:, 1:], Y[1:, 1:], U, V)

plt.show()