Skip to content
Related Articles

Related Articles

Python | frexp() Function
  • Last Updated : 21 Sep, 2018

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.

Code #1:




# 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 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 code demonstrates when error occurs
import math
  
print(math.frexp('25')) 


Output:

TypeError: a float is required

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :