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random.gammavariate() function in Python

  • Last Updated : 26 May, 2020

random module is used to generate random numbers in Python. Not actually random, rather this is used to generate pseudo-random numbers. That implies that these randomly generated numbers can be determined.

random.gammavariate()

gammavariate() is an inbuilt method of the random module. It is used to return a random floating point number with gamma distribution.

Syntax : random.gammavariate(alpha, beta)

Parameters :
alpha : greater than 0
beta : greater than 0

Returns : a random gamma distribution floating number

Example 1:




# import the random module
import random
  
# determining the values of the parameter
alpha = 100
beta = 2
  
# using the gammavariate() method
print(random.gammavariate(alpha, beta))

Output :

4.647425239687329

Example 2: We can generate the number multiple times and plot a graph to observe the gamma distribution.




# import the required libraries 
import random 
import matplotlib.pyplot as plt 
    
# store the random numbers in a  
# list 
nums = [] 
alpha = 9
beta = 0.5
    
for i in range(100): 
    temp = random.gammavariate(alpha, beta)
    nums.append(temp) 
        
# plotting a graph 
plt.plot(nums) 
plt.show()

Output :

Example 3: We can create a histogram to observe the density of the gamma distribution.




# import the required libraries 
import random 
import matplotlib.pyplot as plt 
    
# store the random numbers in a list 
nums = [] 
alpha = 9
beta = 0.5
    
for i in range(10000): 
    temp = random.gammavariate(alpha, beta)
    nums.append(temp) 
        
# plotting a graph 
plt.hist(nums, bins = 200
plt.show()

Output :


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