如何在Python中找到矩阵的行列式？

Question

The task at hand is to find the determinant of A matrix and find the error in detResult variable.

import numpy as np

A = np.array([(1,2),(3,4)])
detResult = A[1,1]*A[2,2]-A[1,2]*A[1,2]  #does not compile

There are 2 ways in which I could get the answer, but I don't see any small/negligible typo in the given version of detResult .

1st way:

det1 = A[0,0:1] * A[1,1:2] - A[0,1:] * A[1,0:1]

2nd way:

det2 = A[0][0] * A[1][1] - A[0][1] * A[1][0]

Answer 1

You may use the inbuilt function in Numpy, numpy.linalg.det() . More information can be found on the Numpy Docs: https://numpy.org/doc/stable/reference/generated/numpy.linalg.det.html