How can matrix A be converted into a reverse matrix without using numpy?
from numpy import array
from numpy.linalg import det
import numpy as np
A = array([[-4,1,0,1,0,0,0,0,0],
[1,-4,1,0,1,0,0,0,0],
[0,2,-4.67,0,0,1,0,0,0],
[1,0,0,-4,1,0,1,0,0],
[0,1,0,1,-4,1,0,1,0],
[0,0,1,0,2,-4.67,0,0,1],
[0,0,0,2,0,0,-4.67,1,0],
[0,0,0,0,2,0,1,-4.67,1],
[0,0,0,0,0,1,0,1,-2.67]])
inv_A = np.linalg.inv(A)
print("Inverse matrix =", inv_A)