python獨立log示例

Python math.log()方法 (Python math.log() method)

math.log() method is a library method of math module, it is used to get the natural logarithm of a given number to base e (by default). It accepts the number and a base (which an optional) and returns the natural logarithm.

math.log()方法是math模塊的庫方法，用于將給定數字的自然對數以e為底(默認情況下)。 它接受數字和一個底數(可選)，并返回自然對數。

Note: If we provide anything else except a number, the method returns a TypeError – "TypeError: a float is required".

注意：如果我們提供除數字以外的任何其他內容，該方法將返回TypeError – “ TypeError：需要浮點數” 。

Syntax of math.log() method:

math.log()方法的語法：

    math.log(x [, base])

Parameter(s):

參數：

• x – is the number whose logarithm to be calculated.

  x –是要計算其對數的數字。

• base – is an optional parameter, it is used to defined any specific base for the logarithm.

  base –是一個可選參數，用于定義對數的任何特定底數。

Return value: float – it returns a float value that is the natural or base specific logarithm of the number x.

返回值： float-返回一個浮點值，該值是數字x的自然或底數對數。

Example:

例：

    Input:
x = 21
# function call
print(math.log(x))
Output:
3.044522437723423

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

# python code to demonstrate example of 
# math.log() method
# importing math module
import math
# log() with 1 parameter
x = 21
print("Natural logarithm of ", x, " is = ", math.log(x))
# log() with 2 parameters
x = 21
base = 5
print("logarithm of ", x, " with base ", base, " is = ", math.log(x, base))

Output

輸出量

Natural logarithm of  21  is =  3.044522437723423
logarithm of  21  with base  5  is =  1.8916681496081529

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

python獨立log示例