---
title: math.log() function
description: math.log() returns the natural logarithm of x.
url: https://docs.influxdata.com/flux/v0/stdlib/math/log/
estimated_tokens: 175
product: Flux
version: v0
publisher: InfluxData
canonical: https://docs.influxdata.com/flux/v0/stdlib/math/log/
date: '2024-04-08T16:01:02-06:00'
lastmod: '2024-04-08T16:01:02-06:00'
---

* Flux 0.22.0+

InfluxDB support

`math.log()` returns the natural logarithm of `x`.

##### Function type signature

```js
(x: float) => float
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### x

(Required)
Value to operate on.

## Examples

* [Return the natural logarithm of a value](#return-the-natural-logarithm-of-a-value)
* [Use math.log in map](#use-mathlog-in-map)

### Return the natural logarithm of a value

```
import "math"

math.log(x: 3.14)// 1.144222799920162

```

### Use math.log in map

```js
import "sampledata"
import "math"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.log(x: r._value)}))
```