python3中numpy矩阵操作与线性方程组

　　线性方程组要多引入一个模块from numpy.linalg import *

对矩阵进行单位阵初始化、求逆、转置、求行列式、解线性方程组操作。

#encoding = utf-8
#矩阵操作和线性方程组
import numpy as np
from numpy.linalg import *
print(np.eye(3))
list1 = np.array([[1,2],
                [3,4]])
print("Inv:")
print(inv(list1))
print("T:")
print(list1.transpose())
print("Det:")
print(det(list1))
print(eig(list1))
print("Solve:")
y = np.array([[5],[7]])
print(solve(list1,y))

运行结果：
[[ 1.  0.  0.]
 [ 0.  1.  0.]
 [ 0.  0.  1.]]
Inv:
[[-2.   1. ]
 [ 1.5 -0.5]]
T:
[[1 3]
 [2 4]]
Det:
-2.0
(array([-0.37228132,  5.37228132]), array([[-0.82456484, -0.41597356],
       [ 0.56576746, -0.90937671]]))
Solve:
[[-3.]
 [ 4.]]