Inserting A 2D array into another 2D array in python

Question

I want to insert a numpy array A of size 508x12 into another numpy array B of size 508x13 resulting in an array of size 508x25. But here is the thing, i don't just want to concatanete them, but insted insert the array at one specific column location c.

How would I do that?, I have tried:

C = np.insert(B, c, A, axis=1)

Hello! I am not too sure if this is possible with insert(), maybe someone will bring up a better answer. But in the meantime, I'd suggest that you can relatively safely use something like C = np.concatenate([B[:, 0:c], A, B[:, c:]], axis=1), in case this helps. I hope I got the dimensions right. — brezniczky
– brezniczky, Commented Nov 9, 2019 at 23:00

jammertheprogrammer · Accepted Answer · 2019-11-10 04:27:52Z

1

Just split up the concatenation like @brezniczky suggested. Alternatively, use hstack:

import numpy as np


a = np.ones((508,12))
b = np.zeros((508,13))

col = 3

final = np.hstack((b[:,0:col],a,b[:,col:])) 

print(final[0])

[0. 0. 0. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]

In this scenario hstack and concatenation with axis=1 are the same, I just prefer hstack for better readability

answered Nov 10, 2019 at 4:27

jammertheprogrammer

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