# python 绘制直方图
import numpy as np
import matplotlib.pyplot as plt
np.random.seed(0)
mu = 200
sigma = 25
x = np.random.normal(mu, sigma, size=100)
print(x)
fig, (ax0, ax1) = plt.subplots(ncols=2, figsize=(8, 4))
ax0.hist(x, 20, normed=1, histtype='stepfilled', facecolor='g', alpha=0.75)
ax0.set_title('stepfilled')
# Create a histogram by providing the bin edges (unequally spaced).
bins = [100, 150, 180, 195, 205, 220, 250, 300]
ax1.hist(x, bins, normed=1, histtype='bar', rwidth=0.8)
ax1.set_title('unequal bins')
fig.tight_layout()
plt.show()
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