练习：Poisson分布
#coding:utf-8
#/usr/bin/python
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
if __name__ == '__main__':
mpl.rcParams['font.sans-serif'] = [u'SimHei']
mpl.rcParams['axes.unicode_minus'] = False # win正常显示中文设置
x = np.random.poisson(lam=5, size=10000)
print(x)
pillar = 15
a = plt.hist(x, bins=pillar, normed=True, range=[0, pillar], color='g', alpha=0.5)
plt.grid()
plt.show()
print(a)
print(a[0].sum())
