How to merge 2D arrays along rows in Python

Question

I have two 2D numpy arrays and I want to add one to the end of other.

Example:

`

My arrays are a & b:
a = [[ 1 , 2],
     [ 2 , 4],
     [ 6 , 8]]
b = [[ 3 , 5],
     [ 7 , 4]]
The result will be:
C = [[ 1 , 2],
     [ 2 , 4],
     [ 6 , 8],
     [ 3 , 5],
     [ 7 , 4]]

`

using python 'extend' is an option for you --> tutorialspoint.com/python/list_extend.htm — brw59
– brw59, Commented Apr 23, 2018 at 23:29

Primusa · Accepted Answer · 2018-04-23 23:27:46Z

2

You can use np.concatenate():

c = np.concatenate((a, b), axis=0)

answered Apr 23, 2018 at 23:27

Primusa

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2 Comments

brw59 Over a year ago

note: this returns a ndarray, so cast back to a list if that isn't wanted

Primusa Over a year ago

I am happy to help :)

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