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random.lognormvariate() function in Python

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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.lognormvariate()

lognormvariate() is an inbuilt method of the random module. It is used to return a random floating point number with log-normal distribution.
Syntax : random.lognormvariate(mu, sigma) Parameters : mu : mean sigma : standard deviation, greater than 0 Returns : a random log-normal distribution floating number
Example 1:
# import the random module
import random
  
# determining the values of the parameters
mu = 0
sigma = 0.25
  
# using the lognormvariate() method
print(random.lognormvariate(mu, sigma))

                    
Output :
0.8585439051088984
Example 2: We can generate the number multiple times and plot a graph to observe the log-normal distribution.
# import the required libraries 
import random 
import matplotlib.pyplot as plt 
  
# store the random numbers in a  
# list 
nums = [] 
mu = 0
sigma = 0.25
    
for i in range(100): 
    temp = random.lognormvariate(mu, sigma)
    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 log-normal distribution.
# import the required libraries 
import random 
import matplotlib.pyplot as plt 
    
# store the random numbers in a list 
nums = [] 
mu = 0
sigma = 0.25
    
for i in range(10000): 
    temp = random.lognormvariate(mu, sigma) 
    nums.append(temp) 
        
# plotting a graph 
plt.hist(nums, bins = 200
plt.show()

                    
Output :

Last Updated : 26 May, 2020
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