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Mathematical Functions in Python | Set 4 (Special Functions and Constants)
  • Difficulty Level : Easy
  • Last Updated : 29 Jul, 2016

Some of the mathematical functions are discussed in below set 1, set 2 and set 3
Mathematical Functions in Python | Set 1 (Numeric Functions)
Mathematical Functions in Python | Set 2 (Logarithmic and Power Functions)
Mathematical Functions in Python | Set 3 (Trigonometric and Angular Functions)

Special Functions and constants are discussed in this article.

1. gamma() :- This function is used to return the gamma function of the argument.




# Python code to demonstrate the working of
# gamma()
   
# importing "math" for mathematical operations
import math
  
a = 4
  
# returning the gamma() of 4
print ("The gamma() of 4 is : ", end="")
print (math.gamma(a))


Output:

The gamma() of 4 is : 6.0

2. pi :- This is an inbuilt constant that outputs the value of pi(3.141592).



3. e :- This is an inbuilt constant that outputs the value of e(2.718281).




# Python code to demonstrate the working of
# const. pi and e
   
# importing "math" for mathematical operations
import math
  
# returning the value of const. pi
print ("The value of const. pi is : ", end="")
print (math.pi)
  
# returning the value of const. e
print ("The value of const. e is : ", end="")
print (math.e)


Output:

The value of const. pi is : 3.141592653589793
The value of const. e is : 2.718281828459045

4. inf :- This is a positive floating point infinity constant. -inf is used to denote the negative floating point infinity. This constant is defined in python 3.5 and above.

5. isinf() :- This function is used to check whether the value is an infinity or not.

6. nan :- This constant denotes “Not a number” in python. This constant is defined in python 3.5 and above.

7. isnan() :- This function returns true if the number is “nan” else returns false.




# Python code to demonstrate the working of
# inf, nan, isinf(), isnan()
   
# importing "math" for mathematical operations
import math
  
# checking if number is nan
if (math.isnan(math.nan)):
       print ("The number is nan")
else : print ("The number is not nan")
  
# checking if number is positive infinity
if (math.isinf(math.inf)):
       print ("The number is positive infinity")
else : print ("The number is not positive infinity")


Output:

The number is nan
The number is positive infinity

This article is contributed by Manjeet Singh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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