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 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： 数学模块math.frexp()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math.frexp()方法相反。 换句话说，w可以理解math.frexp()方法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 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
输出量
16.0
0.0
10.0
-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 module
import math
a = 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
输出量
frexp() result: (0.625, 4)
Extracted part from frexp_result...
x = 0.625
i = 4
ldexp() result: 10.0
翻译自: https://www.includehelp.com/python/math-ldexp-method-with-example.aspx
gdb ldexp
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