VStack Simple

import numpy as np
a = np.array([1, 2, 3])
b = np.array([19, 22, 33])
c = np.vstack((a, b))
c
array([[ 1,  2,  3],
       [19, 22, 33]])

# It will stack row wise (vertically)
a.shape
(3,)

c.shape
(2, 3)

c.ndim
2