Python matplot画散列图

同matlab一样，matplot也可画散列图scatter。

import numpy as np
import matplotlib.pyplot as plt
#fig = plt.figure()
#ax = fig.add_subplot(111)
a1 = np.array([1, 2, 3, 4])
a2 = np.array([1, 2, 3, 4])
#ax.scatter(np.random.rand(5), np.random.rand(5))
#mark = ['s','o','^','v','>','<','d','p','h','8','+','*']
#ax.scatter(a1, a2, marker='s', color='blue')
plt.scatter(a1, a2, marker='s', color='blue', label="TT")
#fig.show()
plt.legend()
plt.show()

显示结果：