>>> a = np.array([1,2,3])
>>> b = np.array([3,2,1])
>>> a*b
array([3, 4, 3])
>>> np.dot(a,b)
10
>>> b = np.array([[2,4,2],[2,3,1],[3,4,1]])
>>> a = np.array([1,2,3])
>>> a*b
array([[2, 8, 6],
       [2, 6, 3],
       [3, 8, 3]])
>>> np.dot(a,b)
array([15, 22,  7])
>>> b*b
array([[ 4, 16,  4],
       [ 4,  9,  1],
       [ 9, 16,  1]])