# -*- coding: utf-8 -*-
"""
Created on Fri Nov 19 10:46:08 2021

@author: Sim
"""

import numpy as np

a1 =[1,2,3]; a2=[4,5,6]

x1 = np.concatenate( (np.array(a1),np.zeros(3), np.array(a2)) )
print('x1:', x1)

x2 = np.concatenate( (np.array([a1]), [np.zeros(2)], np.array([a2])), 
                    axis=1)
print('x2:', x2)

x3= np.concatenate( (np.array([a1]), [np.zeros(3)], np.array([a2])), 
                   axis=None)
print('x3:', x3)


x4 = np.c_[np.array([[1,2,3]]), 0, 0, np.array([[4,5,6]])]
print('x4:', x4)
x5 = np.r_[np.array([1,2,3]), 0, 0, np.array([4,5,6])]
print('x5:', x5)