Perkalian Vektor (dot dan cross) pemrograman python

import numpy as np

a1 = np.array ([1, 3])

b1 = np.array ([2, 1])

# perkalian dot

c1 = np.dot (a1,b1)

print (c1)

a2 = np.array ([1, 2, 0])

b2 = np.array ([2, 1, 0])

# perkalian cross

c2 = np.cross (a2,b2)

c3 = np.cross (b2,a2)

print (c2)

print (c3)