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"""
==================
quiver(X, Y, U, V)
==================
Plot a 2D field of arrows.
See `~matplotlib.axes.Axes.quiver`.
"""
import matplotlib.pyplot as plt
import numpy as np
plt.style.use('_mpl-gallery-nogrid')
# make data
x = np.linspace(-4, 4, 6)
y = np.linspace(-4, 4, 6)
X, Y = np.meshgrid(x, y)
U = X + Y
V = Y - X
# plot
fig, ax = plt.subplots()
ax.quiver(X, Y, U, V, color="C0", angles='xy',
scale_units='xy', scale=5, width=.015)
ax.set(xlim=(-5, 5), ylim=(-5, 5))
plt.show()
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