Test if NumPy array contains only zeros

Learn, how to test if NumPy array contains only zeros in Python? By Pranit Sharma Last updated : October 08, 2023

NumPy is an abbreviated form of Numerical Python. It is used for different types of scientific operations in python. Numpy is a vast library in python which is used for almost every kind of scientific or mathematical operation. It is itself an array which is a collection of various methods and functions for processing the arrays.

Problem statement

Suppose we need to create a NumPy array of length n, and each element of this array would be 0.

Now we need to check whether all the elements are 0 or not. The method which we will define for this purpose would return True if all the elements are 0 otherwise False.

Checking whether NumPy array contains only zeros

For this purpose, we will use numpy.any() method. It is used to test whether any array element along a given axis evaluates to True and it returns a single boolean if the axis is None.

Let us understand with the help of an example,

Python program to check whether NumPy array contains only zeros

# Import numpy
import numpy as np

# Creating a numpy array
arr = np.zeros((3,4))

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

# Checking whether all elements are 0 or not
res = not np.any(arr)

# Display result
print("Result is:\n",res,"\n")