python3随笔-特征值,特征向量,逆矩阵

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import numpy as np
x=np.diag((1,2,3))#对角阵
print(x)
a,b=np.linalg.eig(x)#特征值给a，特征向量给b
print(a)
print(b)

[[1 0 0]
[0 2 0]
[0 0 3]]
[1. 2. 3.]
[[1. 0. 0.]
[0. 1. 0.]
[0. 0. 1.]]

import numpy as np
x=np.diag((1,2,3))#对角阵
print(x)
a,b=np.linalg.eig(x)#特征值给a，特征向量给b
print(a)
print(b)
A=np.arange(4).reshape(2,2)
print(np.linalg.inv(A))#逆矩阵

[[1 0 0]
[0 2 0]
[0 0 3]]
[1. 2. 3.]
[[1. 0. 0.]
[0. 1. 0.]
[0. 0. 1.]]
[[-1.5 0.5]
[ 1. 0. ]]