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Numpy – Get Absolute Value of Each Element

The Numpy library in Python comes with a number of built-in functions to perform common mathematical operations on arrays. In this tutorial, we will look at one such function that helps us get the elementwise absolute value of a Numpy array with the help of some examples.

How to get the absolute value in Numpy?

get absolute value of each array element in numpy array

You can use the numpy.absolute() function to get the absolute value of each element in a Numpy array. Pass the array as an argument.

The following is the syntax –

numpy.absolute(ar)

It returns an array containing the absolute value of each element in the passed array.

Let’s now look at a step-by-step example of using the numpy.absolute() function.

Step 1 – Create a Numpy array

First, we will create a Numpy array that we will use throughout this tutorial.

import numpy as np

# create numpy array
ar = np.array([1, -3, 4, 0, 5, -2, -7])
# display the array
print(ar)

Output:

[ 1 -3  4  0  5 -2 -7]

Here, we used the numpy.array() function to create a Numpy array containing some numbers. You can see that this array contains both positive and negative numbers (along with a 0).

Step 2 – Get absolute value using numpy.absolute()

To get the absolute value of each element in a Numpy array, pass the array as an argument to the numpy.absolute() function.

Let’s get the absolute value for the array created above.

# get absolute value
np.absolute(ar)

Output:

array([1, 3, 4, 0, 5, 2, 7])

We get a Numpy array with the absolute value of each element in the array ar.

You can also use numpy.abs() as a shorthand for the numpy.absolute() function.

# get absolute value
np.abs(ar)

Output:

array([1, 3, 4, 0, 5, 2, 7])

We get the same result as above.

The numpy.absolute() function works similarly on higher-dimensional arrays. For example, let’s apply this function to a 2D array of some numbers.

# create 2D numpy array
ar = np.array([[1, -3, 4],
               [0, 5, -2],
               [-6, 8, -7]])
# get absolute value
np.abs(ar)

Output:

array([[1, 3, 4],
       [0, 5, 2],
       [6, 8, 7]])

You can see that we get the absolute value of each element in the 2D array.

For more on the numpy.absolute() function, refer to its documentation.

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Author

  • Piyush is a data scientist passionate about using data to understand things better and make informed decisions. In the past, he's worked as a Data Scientist for ZS and holds an engineering degree from IIT Roorkee. His hobbies include watching cricket, reading, and working on side projects.