random.gammavariate() function in Python (original) (raw)

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 0Returns : a random gamma distribution floating number

Example 1:

Python3 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.

Python3 1== `

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.

Python3 1== `

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 :