numpy-np.c_[] VS np.r_[]

• np.r_[]

It concatenates arrays along first axis.

 

• np.c_[]

It concatenates arrays along second axis.

a = np.array([[1, 2, 3],
              [11,22,33]]
            )
b = np.array([[4, 5, 6],
              [44,55,66]]
            )
                   
np.r_[a,b]
>>>
array([[ 1,  2,  3],
       [11, 22, 33],
       [ 4,  5,  6],
       [44, 55, 66]])
       
np.c_[a,b]
>>>
array([[ 1,  2,  3,  4,  5,  6],
       [11, 22, 33, 44, 55, 66]])