mathjs/docs/reference/functions/random.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function random

Return a random number larger or equal to `min` and smaller than `max`
using a uniform distribution.


## Syntax

```js
math.random()                // generate a random number between 0 and 1
math.random(max)             // generate a random number between 0 and max
math.random(min, max)        // generate a random number between min and max
math.random(size)            // generate a matrix with random numbers between 0 and 1
math.random(size, max)       // generate a matrix with random numbers between 0 and max
math.random(size, min, max)  // generate a matrix with random numbers between min and max
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`size` | Array &#124; Matrix | If provided, an array or matrix with given size and filled with random values is returned
`min` | number | Minimum boundary for the random value, included
`max` | number | Maximum boundary for the random value, excluded

### Returns

Type | Description
---- | -----------
number &#124; Array &#124; Matrix | A random number


## Examples

```js
math.random()       // returns a random number between 0 and 1
math.random(100)    // returns a random number between 0 and 100
math.random(30, 40) // returns a random number between 30 and 40
math.random([2, 3]) // returns a 2x3 matrix with random numbers between 0 and 1
```


## See also

[randomInt](randomInt.md),
[pickRandom](pickRandom.md)