gdb ldexp

Python math.ldexp()方法 (Python math.ldexp() method)

math.ldexp() method is a library method of math module, it is used to calculate expression x*(2**i), where x is a mantissa and i is an exponent. It accepts two numbers (x is either float or integer, i is an integer) and returns the result of the expression x*(2**i)).

math.ldexp()方法是數(shù)學(xué)模塊的庫(kù)方法，用于計(jì)算表達(dá)式x *(2 ** i) ，其中x是尾數(shù)， i是指數(shù)。 它接受兩個(gè)數(shù)字( x是浮點(diǎn)數(shù)或整數(shù)， i是整數(shù))，并返回表達(dá)式x *(2 ** i)的結(jié)果 。

Note: There is a method in math module math.frexp() that is used to get the pair of mantissa and exponent in a tuple. The math.ldexp() method is an inverse of math.frexp() method. In other words, w can understand that math.frexp() method returns mantissa and exponent of a number and math.ldexp() method reforms/creates the number again using x – mantissa and i – exponent.

注意： 數(shù)學(xué)模塊math.frexp()中有一種方法可用于獲取元組中的尾數(shù)對(duì)和指數(shù)對(duì)。 math.ldexp()方法與math.frexp()方法相反。 換句話(huà)說(shuō)，w可以理解math.frexp()方法返回?cái)?shù)字的尾數(shù)和指數(shù)，而math.ldexp()方法再次使用x –尾數(shù)和i –指數(shù)來(lái)重整 /創(chuàng)建數(shù)字。

Syntax of math.ldexp() method:

math.ldexp()方法的語(yǔ)法：

math.ldexp(x, i)

Parameter(s): x, i – the numbers to be calculated the expression "x*(2**i)".

參數(shù)： x，i –要計(jì)算的數(shù)字，表達(dá)式為“ x *(2 ** i)” 。

Return value: float – it returns a float value that is the result of expression "x*(2**i)".

返回值： float-它返回一個(gè)浮點(diǎn)值，該值是表達(dá)式“ x *(2 ** i)”的結(jié)果 。

Example:

例：

Input:x = 2i = 3# function callprint(math.ldexp(x,i))Output:16.0 # (x*(2**i) = (2*(2**3)) = 16

Python代碼演示math.ldexp()方法的示例 (Python code to demonstrate example of math.ldexp() method)

# python code to demonstrate example of # math.ldexp() method# importing math module import math# number x = 2 i = 3 # math.ldexp() method print(math.ldexp(x,i))x = 0 i = 0 # math.ldexp() method print(math.ldexp(x,i))x = 0.625 i = 4 # math.ldexp() method print(math.ldexp(x,i))x = -0.639625 i = 4 # math.ldexp() method print(math.ldexp(x,i))

Output

輸出量

16.0 0.0 10.0 -10.234

區(qū)分math.frexp()和math.ldexp()方法的Python代碼 (Python code to differentiate the math.frexp() and math.ldexp() methods)

Here, we have a number a and finding it's mantissa and exponent as a pair (x, i), and again making the same number by using math.ldexp() method that calculates the expression (x*(2**i))

在這里，我們有一個(gè)數(shù)字a，并找到它的尾數(shù)和指數(shù)對(duì)(x，i) ，然后再次使用math.ldexp()方法來(lái)計(jì)算表達(dá)式(x *(2 ** i)

# python code to demonstrate example of # math.ldexp() method# importing math module import matha = 10 frexp_result = math.frexp(a) print("frexp() result: ", frexp_result)# extracing its values x = frexp_result[0] i = frexp_result[1] print("Extracted part from frexp_result...") print("x = ", x) print("i = ", i)# now using method ldexp() ldexp_result = math.ldexp(x,i) print("ldexp() result: ", ldexp_result)

Output

輸出量

frexp() result: (0.625, 4) Extracted part from frexp_result... x = 0.625 i = 4 ldexp() result: 10.0

翻譯自: https://www.includehelp.com/python/math-ldexp-method-with-example.aspx

gdb ldexp

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