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
- arr is a numpy array.
- c is a constant.
- output is the resulting numpy array.
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.
Run Code Copy
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)
In this NumPy Tutorial, we learned how to multiply a constant to each of the elements in array using multiplication operator.