Unsure how to concatenate each numpy array within a list

Question

I have two lists that contain thousands of numpy arrays.

I would like to find an efficient way to concatenate each numpy array that is located at the same index.

For example:

list1 = [[0,0,2],[0,5,6]]
list2 = [[3,4,6],[1,7,8]]

final_list = [[0,0,2,0,5,6],[3,4,6,1,7,8]]

I need to do this for a list of size 3300.

You gave us a pure list example, but talk about lists of arrays. Please be consistent. A list answer will be different from a numpy array one. — hpaulj
– hpaulj, Commented Nov 28, 2017 at 20:28

BatyaGG · Accepted Answer · 2017-11-28 20:29:24Z

1

import numpy as np

list1 = [np.array([0,0,2]),np.array([0,5,6])]
list2 = [np.array([3,4,6]),np.array([1,7,8])]

final_list = np.hstack((list1, list2))
print final_list

answered Nov 28, 2017 at 20:29

BatyaGG

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