mathjs/docs/reference/functions/kldivergence.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 kldivergence

Calculate the Kullback-Leibler (KL) divergence  between two distributions


## Syntax

```js
math.kldivergence(x, y)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`q` | Array &#124; Matrix | First vector
`p` | Array &#124; Matrix | Second vector

### Returns

Type | Description
---- | -----------
number | Returns distance between q and p


## Examples

```js
math.kldivergence([0.7,0.5,0.4], [0.2,0.9,0.5])   //returns 0.24376698773121153

```