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Python math gamma()用法及代码示例


Python用其语言允许进行各种数学运算,这在科学领域具有多种应用。这样的Python产品之一就是内置的gamma()函数,该函数以数字方式计算函数中传递的数字的伽玛值。

用法:math.gamma(x)
参数:
x: The number whose gamma value needs to be computed.

返回值:伽玛值,在数值上等于“factorial(x-1)”。


代码1:演示gamma()的工作

# Python code to demonstrate 
# working of gamma() 
import math 
  
# initializing argument 
gamma_var = 6
  
# Printing the gamma value. 
print ("The gamma value of the given argument is:"
                       + str(math.gamma(gamma_var)))

输出:

The gamma value of the given argument is:120.0

factorial()和gamma()

伽玛值也可以使用factorial(x-1),但用例gamma()因为如果我们比较这两个函数以完成相似的任务,gamma()提供更好的性能。

代码2:比较中factorial()gamma()

# Python code to demonstrate 
# factorial() vs gamma() 
import math 
import time  
  
# initializing argument 
gamma_var = 6
  
# checking performance  
# gamma() vs factorial() 
start_fact = time.time() 
res_fact = math.factorial(gamma_var-1) 
  
print ("The gamma value using factorial is:" 
                              + str(res_fact)) 
  
print ("The time taken to compute is:"
        + str(time.time() - start_fact)) 
  
print ('\n') 
  
start_gamma = time.time() 
res_gamma = math.gamma(gamma_var) 
  
print ("The gamma value using gamma() is:"
                           + str(res_gamma)) 
  
print ("The time taken to compute is:" 
       + str(time.time() - start_gamma))

输出:

The gamma value using factorial is:120
The time taken to compute is:9.059906005859375e-06

The gamma value using gamma() is:120.0
The time taken to compute is:5.245208740234375e-06


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注:本文由纯净天空筛选整理自manjeet_04大神的英文原创作品 Python math library | gamma() function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。