Python hstack, vstack example code

import numpy as np

#hstack #1

a = np.array((1,2,3))

b = np.array((2,3,4))

print(np.hstack((a,b)))

>
 [1 2 3 2 3 4]

#hstack #2

a = np.array([[1],[2],[3]])

b = np.array([[2],[3],[4]])

print(np.hstack((a,b)))

>
 [[1 2]
 [2 3]
 [3 4]]

#vstack #1

a = np.array([1, 2, 3])

b = np.array([2, 3, 4])

print(np.vstack((a,b)))

>
 [[1 2 3]
 [2 3 4]]

#vstack #2

a = np.array([[1], [2], [3]])

b = np.array([[2], [3], [4]])

print(np.vstack((a,b)))

>
[[1]
 [2]
 [3]
 [2]
 [3]
 [4]]