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"""
=======================
Pie chart on polar axis
=======================
Demo of bar plot on a polar axis.
"""
import numpy as np
import matplotlib.pyplot as plt
# Compute pie slices
N = 20
theta = np.linspace(0.0, 2 * np.pi, N, endpoint=False)
radii = 10 * np.random.rand(N)
width = np.pi / 4 * np.random.rand(N)
ax = plt.subplot(111, projection='polar')
bars = ax.bar(theta, radii, width=width, bottom=0.0)
# Use custom colors and opacity
for r, bar in zip(radii, bars):
bar.set_facecolor(plt.cm.viridis(r / 10.))
bar.set_alpha(0.5)
plt.show()
"""
==========================
Scatter plot on polar axis
==========================
Demo of scatter plot on a