Plotting quiver decoratedΒΆ

An example showing quiver with decorations.

```import numpy as np
import matplotlib.pyplot as plt

n = 8
X, Y = np.mgrid[0:n, 0:n]
T = np.arctan2(Y - n / 2.0, X - n / 2.0)
R = 10 + np.sqrt((Y - n / 2.0) ** 2 + (X - n / 2.0) ** 2)
U, V = R * np.cos(T), R * np.sin(T)

plt.quiver(X, Y, U, V, R, alpha=0.5)
plt.quiver(X, Y, U, V, edgecolor="k", facecolor="None", linewidth=0.5)

plt.xlim(-1, n)
plt.xticks([])
plt.ylim(-1, n)
plt.yticks([])

# Add a title and a box around it
from matplotlib.patches import FancyBboxPatch

ax = plt.gca()
FancyBboxPatch(
(-0.05, 0.87),
width=0.66,
height=0.165,
clip_on=False,
zorder=3,
facecolor="white",
alpha=1.0,
transform=plt.gca().transAxes,
)
)

plt.text(
-0.05,
1.02,
" Quiver Plot:    plt.quiver(...)\n",
horizontalalignment="left",
verticalalignment="top",
size="xx-large",
transform=plt.gca().transAxes,
)

plt.text(
-0.05,
1.01,
"\n\n    Plot a 2-D field of arrows ",
horizontalalignment="left",
verticalalignment="top",
size="large",
transform=plt.gca().transAxes,
)

plt.show()
```

Total running time of the script: (0 minutes 0.033 seconds)

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