NumPy: Check two random arrays are equal or not

Last update on April 29 2025 12:55:42 (UTC/GMT +8 hours)

10. Check Array Equality

Write a NumPy program to check two random arrays are equal or not.

Sample Solution:

Python Code :

# Importing the NumPy library as np
import numpy as np

# Generating the first array 'x' with 6 random integers (0 or 1) using np.random.randint()
x = np.random.randint(0, 2, 6)

# Printing the first generated array 'x'
print("First array:")
print(x)

# Generating the second array 'y' with 6 random integers (0 or 1) using np.random.randint()
y = np.random.randint(0, 2, 6)

# Printing the second generated array 'y'
print("Second array:")
print(y)

# Checking if the two arrays 'x' and 'y' are equal using np.allclose()
# This function returns True if the two arrays are element-wise equal within a tolerance
array_equal = np.allclose(x, y)

# Printing whether the two arrays are equal or not
print("Test above two arrays are equal or not!")
print(array_equal) 

Sample Output:

First array:                                                           
[1 0 0 0 1 0]                                                          
Second array:                                                          
[0 0 1 1 0 1]                                                          
Test above two arrays are equal or not!                                
False   

Explanation:

In the above exercise –

x = np.random.randint(0, 2, 6): This line creates a 1D array x with 6 random integers between 0 and 1 using the np.random.randint() function. The input values 0 and 2 specify the lower (inclusive) and upper (exclusive) boundaries for the random integers, and 6 is the size of the output array.

y = np.random.randint(0, 2, 6): This line creates another 1D array y with the same specifications as x.

array_equal = np.allclose(x, y): This line checks if the two arrays x and y are element-wise equal using the np.allclose() function. The function returns True if all elements in the arrays are approximately equal within a specified tolerance, and False otherwise. In this case, since we're comparing integers, the default tolerance is effectively zero, meaning that the function checks for exact equality.

Pictorial Presentation:

For more Practice: Solve these Related Problems:

• Write a function that compares two arrays element-wise and returns True if all elements match exactly.
• Implement a solution that checks array equality using np.array_equal and np.allclose for floating-point arrays.
• Create a program that reports the indices where two arrays differ if they are not equal.
• Test the equality function on arrays with different shapes and dtypes to ensure robust error handling.

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