ValueError: Masked arrays must be 1-D 《機器學習-算法原理與編程實踐》鄭捷

import numpy as np
from numpy import *
import matplotlib.pyplot as plt
dataSet = [[1,2],[3,2],[4,1],[3,3],[8,7],[6,8],[9,3],[4,7],[5,8],[6,9]]
dataMat = mat(dataSet).T
plt.scatter(dataMat[0],dataMat[1],c = 'red',marker = 'o')
X = np.linspace(-2,2,100)
Y = 2.8 * X + 9
plt.plot(X,Y)
plt.show()

將第6行修改爲：

plt.scatter(dataMat[0].tolist(),dataMat[1].tolist(),c = 'red',marker = 'o')

則顯示正常，不會報錯！