Python | frexp() Function (original) (raw)

Last Updated : 14 Feb, 2023

frexp() function is one of the Standard math Library function in Python. It returns mantissa and exponent as a pair (m, e) of a given value x, where mantissa m is a floating point number and e exponent is an integer value. m is a float and e is an integer such that x == m * 2**e exactly. If x is zero, returns (0.0, 0), otherwise 0.5 <= abs(m) < 1. This is used to “pick apart” the internal representation of a float in a portable way.

Syntax: math.frexp( x ) Parameters: Any valid number (positive or negative). Returns: Returns mantissa and exponent as a pair (m, e) value of a given number x. Exception: If x is not a number, function will return TypeError.

Time Complexity: O(1)

Auxiliary Space: O(1)

Code #1:

Python3 `

Python3 code demonstrate frexp() function

importing math library

import math

calculating mantissa and

exponent of given integer

print(math.frexp(3)) print(math.frexp(15.7)) print(math.frexp(-15))

`

Output:

(0.75, 2) (0.98125, 4) (-0.9375, 4)

Code #2:

Python3 `

Python3 code demonstrate frexp() function

importing math library

import math

creating a list

lst = [15, 13.76, 17.5, 21]

creating a tuple

tpl = (-15.85, -41.24, -11.2, 54)

calculating mantissa and exponent

of 1st, 3rd elements in list

print(math.frexp(lst[0])) print(math.frexp(lst[2]))

calculating mantissa and exponent

of 2nd, 3rd and 4th elements in tuple

print(math.frexp(tpl[1])) print(math.frexp(tpl[2])) print(math.frexp(tpl[3]))

`

Output:

(0.9375, 4) (0.546875, 5) (-0.644375, 6) (-0.7, 4) (0.84375, 6)

Code #3: If the x parameter is not a number, frexp() function will return a TypeError.

Python3 `

Python3 code demonstrates when error occurs

import math

print(math.frexp('25'))

`

Output:

TypeError: a float is required