matplotlib画直方图（1）

import numpy as np
import matplotlib.pyplot as plt

mu,sigma=100,15
x=mu+sigma*np.random.randn(10000)

n,bins,patches=plt.hist(x,50,normed=1,facecolor='g',alpha=0.75)
plt.xlabel('Smarts')
plt.ylabel('Probability')
plt.title('Histogram of IQ')
plt.text(60,.025, r'$\mu=100,\ \sigma=15$')
plt.axis([40,160,0,0.03])
plt.grid(True)