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()方法是数学模块的库方法，用于计算表达式x *(2 ** i) ，其中x是尾数， i是指数。 它接受两个数字( x是浮点数或整数， i是整数)，并返回表达式x *(2 ** i)的结果 。

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

注意： 数学模块中有一种方法可用于获取元组中的尾数对和指数对。 math.ldexp()方法与相反。 换句话说，w可以理解返回数字的尾数和指数，而math.ldexp()方法再次使用x –尾数和i –指数来重整 /创建数字。

Syntax of math.ldexp() method:

math.ldexp()方法的语法：

math.ldexp(x, i)

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

参数： x，i –要计算的数字，表达式为“ x *(2 ** i)” 。

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

返回值： float-它返回一个浮点值，该值是表达式“ x *(2 ** i)”的结果 。

Example:

例：

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

Python代码演示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 moduleimport math# numberx = 2i = 3# math.ldexp() methodprint(math.ldexp(x,i))x = 0i = 0# math.ldexp() methodprint(math.ldexp(x,i))x = 0.625i = 4# math.ldexp() methodprint(math.ldexp(x,i))x = -0.639625i = 4# math.ldexp() methodprint(math.ldexp(x,i))

Output

输出量

16.00.010.0-10.234

区分math.frexp()和math.ldexp()方法的Python代码 (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))

在这里，我们有一个数字a，并找到它的尾数和指数对(x，i) ，然后再次使用math.ldexp()方法来计算表达式(x *(2 ** i)

# python code to demonstrate example of # math.ldexp() method# importing math moduleimport matha = 10frexp_result = math.frexp(a)print("frexp() result: ", frexp_result)# extracing its valuesx = 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

输出量

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

翻译自:

gdb ldexp