matrix.sagews

from sympy import *

print("\n--- a: -------------------------------")
A = Matrix([ [5, 4], [2, 1] ])
pprint(det(A))

print("\n--- b: -------------------------------")

A = Matrix([ [1, 3, 6], [0, 5, 4], [-1, 2, 1] ])
pprint(det(A))

--- a: ------------------------------- -3 --- b: ------------------------------- 15