How to Multiply Array With Scalar in Python

1. Multiply Elements of an Array With a Scalar Using * in Python
2. Multiply an Array With a Scalar Using the numpy.multiply() Function in Python

This tutorial will introduce methods to multiply elements of a NumPy array with a scalar in Python.

Multiply Elements of an Array With a Scalar Using * in Python

In Python, it is very simple to multiply all the elements of a NumPy array with a scalar. The * operator in the NumPy package can be used for this operation.

The following code example shows us how we can use the * method to multiply all the elements of a NumPy array with a scalar in Python.

import numpy

arr = numpy.array([1, 2, 3])
newarr = arr * 3
print(newarr)

Output:

[3 6 9]

In the above code, we first initialize a NumPy array using the numpy.array() function and then compute the product of that array with a scalar using the * operator.

Multiply an Array With a Scalar Using the numpy.multiply() Function in Python

We can multiply a NumPy array with a scalar using the numpy.multiply() function. The numpy.multiply() function gives us the product of two arrays. numpy.multiply() returns an array which is the product of two arrays given in the arguments of the function.

The following code example shows us how to use the numpy.multiply() function to multiply all the elements of a NumPy array with a scalar in Python.

import numpy

arr = numpy.array([1, 2, 3])
newarr = numpy.multiply(arr, 3)
print(newarr)

Output:

[3 6 9]

In the above code, we first initialize a NumPy array using numpy.array() function and then compute the product of that array with a scalar using the numpy.multiply() function.