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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 | Matrix | First vector
`p` | Array | 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
```