Linear algebra

Import numpy firstly

import numpy as np

Matrix production

>>> a = np.array([[2,3,0], [1,2,0]])
>>> b = np.array([[1,0], [0,2], [3,0]])
>>> np.dot(a,b)
array([[2, 6],
       [1, 4]])

Determinant of an array (数组的行列式)

>>> b = np.array([[1,-1,0], [4,-5,-3], [2,3,6]])
>>> np.linalg.det(b)
9.0000000000000018