matplotlib画直方图（1）

import numpy as npimport matplotlib.pyplot as pltmu,sigma=100,15x=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)