Rounding Decimals

There are primarily five ways of rounding off decimals in NumPy:

Truncation

Remove the decimals, and return the float number closest to zero. Use the trunc() and fix() functions.

Truncate elements of following array:

import numpy as np

arr = np.trunc([-3.1666, 3.6667])

print(arr)

Same example, using fix():

import numpy as np

arr = np.fix([-3.1666, 3.6667])

print(arr)

The around() function increments preceding digit or decimal by 1 if >=5 else do nothing.

E.g. round off to 1 decimal point, 3.16666 is 3.2

Round off 3.1666 to 2 decimal places:

import numpy as np

arr = np.around(3.1666, 2)

print(arr)

The floor() function rounds off decimal to nearest lower integer.

E.g. floor of 3.166 is 3.

Floor the elements of following array:

import numpy as np

arr = np.floor([-3.1666, 3.6667])

print(arr)

The ceil() function rounds off decimal to nearest upper integer.

E.g. ceil of 3.166 is 4.

Ceil the elements of following array:

import numpy as np

arr = np.ceil([-3.1666, 3.6667])

print(arr)