Topics
NumPy provides many functions to create new arrays from existing arrays.
Vertical and Horizontal stacking
Given two or more existing arrays, you can stack them vertically using the vstack() function and horizontally using hstack().
from numpy import array
from numpy import vstack
a1 = array([1,2,3])
a2 = array([4,5,6])
print(a1)
print(a2)
# vertical and horizontal stack
a3 = vstack((a1, a2))
a4 = hstack((a1, a2))
print(a3)
print(a3.shape)
print(a4)
print(a4.shape)a1: [1 2 3]
a2: [4 5 6]
vstack: [[1 2 3]
[4 5 6]]
vstack shape: (2, 3)
hstack: [1 2 3 4 5 6]
hstack shape: (6,)