w3resource

NumPy: Replace the negative values in a NumPy array with 0

NumPy: Array Object Exercise-90 with Solution

Replace Negative Values with 0

Write a NumPy program to replace the negative values in a NumPy array with 0.

Pictorial Presentation:

Python NumPy: Replace the negative values in a NumPy array with 0

Sample Solution:

Python Code:

# Importing the NumPy library and aliasing it as 'np'
import numpy as np

# Creating a NumPy array 'x' containing integers
x = np.array([-1, -4, 0, 2, 3, 4, 5, -6])

# Printing a message indicating the original array will be displayed
print("Original array:")

# Printing the original array 'x' with its elements
print(x)

# Printing a message indicating the replacement of negative values in the array with 0
print("Replace the negative values of the said array with 0:")

# Replacing all negative values in the array 'x' with 0 using boolean indexing
x[x < 0] = 0

# Printing the modified array 'x' after replacing negative values with 0
print(x)

Sample Output:

Original array:                                                        
[-1 -4  0  2  3  4  5 -6]                                              
Replace the negative values of the said array with 0:                  
[0 0 0 2 3 4 5 0]

Explanation:

In the above code –

x = np.array(...) – This part creates a NumPy array 'x' with the given elements.

x[x < 0] = 0: Use boolean indexing to identify and replace all negative elements in the array 'x' with zeros. The expression x < 0 creates a boolean array with the same shape as 'x', where each element is True if the corresponding element in 'x' is negative and False otherwise. The assignment x[x < 0] = 0 replaces all elements of 'x' for which the corresponding boolean value is True with zeros.

print(x): Print the modified array 'x'.

Python-Numpy Code Editor:

Previous: Write a NumPy program to remove specific elements in a NumPy array.
Next: Write a NumPy program to remove all rows in a NumPy array that contain non-numeric values.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://www.w3resource.com/python-exercises/numpy/python-numpy-exercise-90.php