Python | ldexp() function

ldexp() function is one of the Standard math library function in Python, which returns x * (2**i). This is also called as inverse of Python frexp() function.

Syntax: math.ldexp(x, i)

Parameters:
x : Any valid number (+ve or -ve)
i : Any valid number (+ve or -ve)

Returns : Returns the value of x * (2**i).

For example, if x = 3 and i = 4 then, Math.ldexp(3, 4) = 3*16 = 48.

Code #1:

filter_none

edit
close

play_arrow

link
brightness_4
code

# Python3 code demonstrate ldexp() function
  
# importing math library
import math 
  
# ldexp() Function on +ve nd -ve Numbers
print(math.ldexp(9, 3))
print(math.ldexp(-5, 2))
  
# ldexp() Function on fractional Number
print(math.ldexp(3.5, 2))
print('%.2f' %math.ldexp(-6.8, 3))

chevron_right






                        filter_none








Output:


72.0
-20.0
14.0
-54.40



 

Code #2:











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















# Python3 code demonstrate ldexp() function 


  


# importing math library 


import math  


  


# Tuple Declaration  


tpl = (9, -5, 3.5, -6.8) 


  


# List Declaration  


lst = [13, 4, 8.4, -6.7] 


  


# ldexp() Function on +ve nd -ve Numbers 


print(math.ldexp(tpl[0], 3)) 


print(math.ldexp(tpl[3], 2)) 


  


# ldexp() Function on fractional Number 


print(math.ldexp(lst[1], 2)) 


print('%.2f' %math.ldexp(lst[2], 3)) 



















                        chevron_right







                        filter_none








Output:


72.0
-27.2
16.0
67.20


 


Code #3: If the X value or i value argument is not a number, ldexp() function will return TypeError.











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















# Python3 code demonstrates when error occurs 


  


# importing the math library 


import math 


  


# string value taken  


print(math.ldexp('25', 5)) 


print(math.ldexp(25, '5')) 



















                        chevron_right







                        filter_none








Output:


TypeError: a float is required
TypeError: a float is required



          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Image
jana_sayantan
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.