Contents

## 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.

## Example

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 **Output**

## Summary

In this Numpy Tutorial of Python Examples, we learned how to multiply a constant to each of the elements in array using multiplication operator.