numpy生成范德蒙矩阵

1.源码实现

import numpy as np

x1 = np.array([1, 2, 3, 4])
v1 = np.vander(x1)

x2 = np.array([1.0, 1.5, 2.0, 2.5, 3.0])
v2 = np.vander(x2)

print(v1)
print(v2)

2.运行及其结果

$ python3 vander.py 
[[ 1  1  1  1]
 [ 8  4  2  1]
 [27  9  3  1]
 [64 16  4  1]]
[[  1.       1.       1.       1.       1.    ]
 [  5.0625   3.375    2.25     1.5      1.    ]
 [ 16.       8.       4.       2.       1.    ]
 [ 39.0625  15.625    6.25     2.5      1.    ]
 [ 81.      27.       9.       3.       1.    ]]