D3.js randomLogNormal() Function

Namachila November 1, 2025

0 0 1 minute read

The d3.randomLogNormal() function is used to generate the random number based on the log-normal function.

Syntax:

d3.randomLogNormal(mu,sigma);

Parameters: This function accepts two parameters as mentioned above and described below:

mu: It is the expected value of the random variable.
sigma: The number is generated with a given standard deviation called sigma.

Returns: It returns a function.

Note: If mu and sigma is not given then mu is equal to 0 and sigma to 1 by default.

Below given are a few examples of the above function.

Example 1: The output may be different each time the function is executed.

HTML

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width, initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!-- Fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    // Output may be different each time  
    // the function is run 
    console.log(d3.randomLogNormal(2,10)()) 
    console.log(d3.randomLogNormal(0,0)()) 
    console.log(d3.randomLogNormal(1,12)()) 
    console.log(d3.randomLogNormal(10,0)()) 
    console.log(d3.randomLogNormal(5,1)()) 
  </script> 
</body> 
</html>

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width, initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!-- Fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    // Output may be different each time  
    // the function is run 
    console.log(d3.randomLogNormal(2,10)(1)) 
    console.log(d3.randomLogNormal(0,0)(2)) 
    console.log(d3.randomLogNormal(1,12)(3)) 
    console.log(d3.randomLogNormal(10,0)(0)) 
    // When mu and sigma is not given 
    console.log(d3.randomLogNormal()()) 
  </script> 
</body> 
</html>

Output:

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