numpy matrices code example

Example 1: numpy matrix

>>> np.array([[1, 2], [3, 4]])
array([[1, 2],
       [3, 4]])
#np.matrix is no longer recommended!

Example 2: numpy matrix in python 3

np.matrix([[1, 2], [3, 4]])

# matrix([[1, 2],
#         [3, 4]])