D3.js randomNormal() Function

Last Updated : 10 Apr, 2023

The randomNormal() function is used to return a function that gives a random number based on Normal distribution or Gaussian distribution.

Syntax:

d3.randomNormal(mu, sigma);

Parameters: It takes the two parameters given above and described below.

mu: It is the expected value of the number. If mu is not given then it is considered as 0.
sigma: The number is generated with a certain standard deviation called sigma.

Returns: It returns a function.

Below given are a few examples of the above function.

Example 1: When mu is given.

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>
// The output may be different on different machines.
    console.log(d3.randomNormal(10, 10)())
    console.log(d3.randomNormal(10, 10)())
    console.log(d3.randomNormal(10, 10)())
    console.log(d3.randomNormal(10, 10)())
    console.log(d3.randomNormal(10, 10)())
  </script>
</body>
</html>

Output:

Example 2: When mu is not given.

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>
// The output may be different on different machines.
    console.log(d3.randomNormal(5)())
    console.log(d3.randomNormal(5)())
    console.log(d3.randomNormal(5)())
    console.log(d3.randomNormal(5)())
    console.log(d3.randomNormal(5)())
    console.log(d3.randomNormal(5)())
  </script>
</body>
</html>