Python NumPy - Add a new row of zeros to the bottom of an array

By IncludeHelp Last updated : September 11, 2024

Problem statement

Given a NumPy array, write a Python program to add a new row of zeroes at the bottom of this array.

Adding a new row of zeros to the bottom of an array

To add a new row of zeros to the bottom of the array, we will first create a new row of zeros with the same number of columns as the input array and then we will use numpy.row_stack() to stack this new row below the input array, resulting in a new array with an additional row of zeros at the bottom.

Python code to add a new row of zeros to the bottom of an array

Let us understand with the help of an example:

# Importing numpy
import numpy as np

# Creating an array
arr = np.array([[1, 2], [3, 4]])

# Display original array
print("Original array", arr,"\n")

# Defining a function
def fun(arr):
    # Create a new row of zeros
    zeros_row = np.zeros(arr.shape[1])
    # Stack the new row below the input array 
    # using numpy.row_stack
    new_arr = np.row_stack((arr, zeros_row))
    return new_arr

# Display result
print("Result:\n",fun(arr),"\n")

Output

The output of the above program is:

Original array [[1 2]
 [3 4]] 

Result:
 [[1. 2.]
 [3. 4.]
 [0. 0.]]