matplotlib 制作原始数据的散点图

import numpy as np
import matplotlib.pyplot as plt
returnMat=np.array([[1,2],[3,4]])
fig=plt.figure()
ax=fig.add_subplot(111)
#ax.scatter(returnMat[:,1],returnMat[:,2])
#绘制颜色，大小不同的点
classLabelVector=[1,2]
ax.scatter(returnMat[:,1],returnMat[:,2],15.0*
array(classLabelVector),15.0*array(classLabelVector))
plt.show()