How to round array elements to the given number of decimals using NumPy?

In NumPy, we can round array elements to the given number of decimals with the help of round(). 

Syntax:

np.round(a, decimals=0, out=None)

The first parameter will be an array and the second parameter will be the number of decimals for which needed rounded. If no parameter will be pass as the second parameter then by default it takes 0. It will return round array elements to the given number of decimals.

Example 1:

Python3

import numpy as np


# perform the numpy.round
rounded_array = np.round([1.5, 1.53, 1.23, 3.89])

# print the rounded_array
print(rounded_array)

Output

[2. 2. 1. 4.]

Example 2:

Python3

import numpy as np


# perform the numpy.round
rounded_array = np.round([1.5, 1.53, 1.23, 3.89],
                         decimals=1)

# print the rounded_array
print(rounded_array)

Output:

[1.5 1.5 1.2 3.9]

Example

Python3

import numpy as np


# perform the numpy.round
rounded_array = np.round(
    [1.534, 1.5389, 1.2301, 3.89903, 6.987, 4.09], decimals=2)

# print the rounded_array
print(rounded_array)

Output:

[1.53 1.54 1.23 3.9  6.99 4.09]