random.gammavariate() function in Python

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 :