MeherajUlMahmmud

def ones(rows, cols):
    matrix = [[1 for i in range(cols)] for j in range(rows)]
    return matrix
  
mat = ones(3, 3)

MeherajUlMahmmud

def zeros(rows, cols):
    matrix = [[0 for i in range(cols)] for j in range(rows)]
    return matrix

mat = zeros(3, 3)

MeherajUlMahmmud

def calcDeterminant(matrix):
    det = 0
    for c in range(len(matrix)):
        det += matrix[0][c] * calcMinor(matrix, 0, c)
    return det


def calcMinor(matrix, r, c):
    minor = (matrix[r-2][c-2] * matrix[r-1][c-1]) - (matrix[r-1][c-2] * matrix[r-2][c-1])
    return minor

MeherajUlMahmmud

def calcMinor(matrix, r, c):
    minor = (matrix[r-2][c-2] * matrix[r-1][c-1]) - (matrix[r-1][c-2] * matrix[r-2][c-1])
    return minor

MeherajUlMahmmud

matrix = [[1, 2, 3],
          [0, 1, 4],
          [5, 6, 0]]

MeherajUlMahmmud

def calcCofactorMatrix(matrix):
    cofactor_matrix = [[float(calcMinor(matrix, r, c)) for c in range(3)] for r in range(3)]
    return cofactor_matrix

MeherajUlMahmmud

def inverseUtil(matrix, det):
    inverse_matrix = [[matrix[r][c] * (1 / det) for c in range(3)] for r in range(3)]
    return inverse_matrix

MeherajUlMahmmud

def calcDeterminant(matrix):    
    det = 0
    for c in range(len(matrix)):
        det += matrix[0][c] * calcMinorMeheraj(matrix, 0, c)
    return det