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).
Time Complexity: O(1)
Auxiliary Space: O(1)
For example, if x = 3 and i = 4 then, Math.ldexp(3, 4) = 3*16 = 48.
Code #1:
Python3
# Python3 code demonstrate ldexp() function# importing math libraryimport math # ldexp() Function on +ve nd -ve Numbersprint(math.ldexp(9, 3))print(math.ldexp(-5, 2))# ldexp() Function on fractional Numberprint(math.ldexp(3.5, 2))print('%.2f' %math.ldexp(-6.8, 3)) |
Output:
72.0 -20.0 14.0 -54.40
Code #2:
Python3
# Python3 code demonstrate ldexp() function# importing math libraryimport 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 Numbersprint(math.ldexp(tpl[0], 3))print(math.ldexp(tpl[3], 2))# ldexp() Function on fractional Numberprint(math.ldexp(lst[1], 2))print('%.2f' %math.ldexp(lst[2], 3)) |
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.
Python3
# Python3 code demonstrates when error occurs# importing the math libraryimport math# string value taken print(math.ldexp('25', 5))print(math.ldexp(25, '5')) |
Output:
TypeError: a float is required TypeError: a float is required
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