numpy array 병합

import numpy as np

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

print(np.concatenate((a, b), axis=0))
print(np.concatenate((a, b.T), axis=1))
print(np.concatenate((a, b), axis=None))

출력

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