Numpy: Append or vertically stack vectors and matrices (vstack)

• vstack

import numpy as np

a = np.array([1, 2, 3])
b = np.array([4, 5, 6])
c = np.array([7, 8, 9])
print(a)
print(b)
print(c)
print()

m = np.vstack([a, b])
print(m)
print()

d3 = np.vstack([m, c])
print(d3)

[1 2 3]
[4 5 6]
[7 8 9]

[[1 2 3]
 [4 5 6]]

[[1 2 3]
 [4 5 6]
 [7 8 9]]