Numpy Array – Multiply a constant to all elements
Multiplying a constant to a NumPy array is as easy as multiplying two numbers.
To multiply a constant to each and every element of an array, use multiplication arithmetic operator *. Pass array and constant as operands to the multiplication operator as shown below.
output = arr * c
where
- arr is a numpy array.
- c is a constant.
- output is the resulting numpy array.
Examples
1. Multiply each of the element in the array with 3
In the following python example, we will multiply a constant 3 to an array arr. The resulting array is stored in output.
Python Program
import numpy as np
# 2D array
arr = (np.arange(8)*2).reshape(2,4)
# Print array
print("The array\n", arr)
# Multiplying a constant to all the elements of array
output = arr * 3
print("\nAfter multiplying a constant to all the elements of array\n", output)
Run Code
Output
Summary
In this NumPy Tutorial, we learned how to multiply a constant to each of the elements in array using multiplication operator.