Solution Exercise 552 : python numpy code computing the reverse of given matrix A

Exercise 552

For Given Matrix A: 

1.  Give the python numpy code that compute the reverse B of matrix A 
2. To ensure the result, calculate B.dot (A)

Solution

Question 1

import numpy as np 
A = np.array([[3,2] ,
             [2,3]])

B = np.linalg.inv (A)
print ("The reverse of A is :", B)
# The out put is : The reverse of A is : [[ 0.6 -0.4] [-0.4  0.6]]

Question 2

import numpy as np 
A = np.array([[3,2] ,
             [2,3]])
B = np.linalg.inv(A)
BA = np.dot(A,B)
print(AB)
The output is : [[ 1.00000000e+00  0.00000000e+00]  [-2.22044605e-16  1.00000000e+00]]