python numpy r

1>>> np.r_[np.array([1,2,3]), 0, 0, np.array([4,5,6])]
2array([1, 2, 3, ..., 4, 5, 6])
3>>> np.r_[-1:1:6j, [0]*3, 5, 6]
4array([-1. , -0.6, -0.2,  0.2,  0.6,  1. ,  0. ,  0. ,  0. ,  5. ,  6. ])
5