How to add a border around a NumPy array?

Last Updated : 01 Oct, 2020

Sometimes we need to add a border around a NumPy matrix. Numpy provides a function known as 'numpy.pad()' to construct the border. The below examples show how to construct a border of '0' around the identity matrix.

Syntax :

numpy.pad(array, pad_width, mode='constant', **kwargs)

Example 1: Construct a border of 0s around 2D identity matrix

Python3

# importing Numpy package
import numpy as np

# Creating a 2X2 Numpy matrix
array = np.ones((2, 2))

print("Original array")
print(array)

print("\n0 on the border and 1 inside the array")

# constructing border of 0 around 2D identity matrix
# using np.pad()
array = np.pad(array, pad_width=1, mode='constant',
               constant_values=0)

print(array)

Output:

In the above examples, we construct a border of 0s around the 2-D NumPy matrix.

Example 2: Construct a border of 0s around 3D identity matrix

Python3

# importing Numpy package
import numpy as np

# Creating a 3X3 Numpy matrix
array = np.ones((3, 3))

print("Original array")
print(array)

print("\n0 on the border and 1 inside the array")

# constructing border of 0 around 3D identity matrix
# using np.pad()
array = np.pad(array, pad_width=1, mode='constant',
               constant_values=0)

print(array)

Output:

In the above examples, we construct a border of 0s around the 3-D NumPy matrix.

Example 3: Construct a border of 0s around 4D identity matrix

Python3

# importing Numpy package
import numpy as np

# Creating a 4X4 Numpy matrix
array = np.ones((4, 4))

print("Original array")
print(array)

print("\n0 on the border and 1 inside the array")

# constructing border of 0 around 4D identity matrix
# using np.pad()
array = np.pad(array, pad_width=1, mode='constant',
               constant_values=0)

print(array)

Output:

In the above examples, we construct a border of 0s around the 4-D NumPy matrix.

Python Introduction

vanshgaur14866

Improve

Article Tags :

Practice Tags :

python

How to add a border around a NumPy array?

Similar Reads

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.

How to add a border around a NumPy array?

Similar Reads

Python Fundamentals

Python Data Structures

Advanced Python

Data Science with Python

Web Development with Python

Python Practice

Thank You!

What kind of Experience do you want to share?

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.