Python Splitting numPY 2 D Array

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Please let me know how to split a 2D numPy array with example code. Thanks
Jul 15, 2019 in Python by Tina
12,998 views

1 answer to this question.

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For splitting the 2d array,you can use two specific functions which helps in splitting the NumPy arrays row wise and column wise which are split and hsplit respectively .

1. split function is used for Row wise splitting.

2. hsplit function is used for Column wise splitting .

The simplest way of splitting NumPy arrays can be done on their dimension. A 3 * 4 array can easily be broken into 3 sets of lists for Rows and 4 set of lists using Columns. Here is how we can do the same :

import numpy as np

arr = np.array([[1,2,3,4],

                [5,6,7,8],

                [9,10,11,12]])


arr.shape

# Displays (3,4)


#Split Row Wise

np.split(arr,3)

#Splitted as --> [1,2,3,4] | [5,6,7,8] | [9,10,11,12]


#Split Column Wise

np.hsplit(arr,4)

#Splitted as --> [1,5,9] | [2,6,10] | [3,7,11] | [4,8,12]


This should work.

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answered Jul 15, 2019 by Siri

edited Oct 7, 2021 by Sarfaraz

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