how to apply vectorize between 2 2d arrays code example

Example 1: join two numpy 2d array

import numpy as np

a = np.array([[0, 1, 3], [5, 7, 9]])
b = np.array([[0, 2, 4], [6, 8, 10]])
c = np.concatenate((a, b), axis=0)
print(c)

Output : 
[[ 0  1  3]
 [ 5  7  9]
 [ 0  2  4]
 [ 6  8 10]]

Example 2: resize two dimensional vector c++

//vector<vector<int>> M;
//int m = number of rows, n = number of columns;
M.resize(m, vector<int>(n));