np.mean np.cov numpy.corrcoef pyplot.scatter pyplot.contour函数

np.mean() 搬运 :https://blog.csdn.net/lilong117194/article/details/78397329?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task >>> a = np.array([[1, 2], [3, 4]]) >>> a array([[1, 2], [3, 4]]) >>> np.mean(a) 2.5 >>> np.mean(a, axis=0) # axis=0，计算每一列的均