python画图第二篇

用python画散点图

# -*- coding: UTF-8 -*-

import matplotlib  as mpl
import numpy  as np
import matplotlib.pyplot as plt

n=1024
X=np.random.normal(0,1,n)
Y=np.random.normal(0,1,n)
T=np.arctan2(Y,X)#颜色
plt.scatter(X,Y,s=50,c=T,alpha=0.5)
plt.xlim(-1.5,1.5)
plt.ylim(-1.5,1.5)
plt.xticks(())
plt.yticks(())
plt.show()