---
title: math.exp() function
description: math.exp() returns e**x, the base-e exponential of x.
url: https://docs.influxdata.com/flux/v0/stdlib/math/exp/
estimated_tokens: 1410
product: Flux
version: v0
---

# math.exp() function

-   Flux 0.22.0+
-   View InfluxDB support

`math.exp()` returns `e**x`, the base-e exponential 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 base-e exponential of a value](#return-the-base-e-exponential-of-a-value)
-   [Use math.exp in map](#use-mathexp-in-map)

### Return the base-e exponential of a value

```js
import "math"

math.exp(x: 21.0)// 1.3188157344832146e+09

```

### Use math.exp in map

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

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

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t1 | -2.18 |
| 2021-01-01T00:00:10Z | t1 | 10.92 |
| 2021-01-01T00:00:20Z | t1 | 7.35 |
| 2021-01-01T00:00:30Z | t1 | 17.53 |
| 2021-01-01T00:00:40Z | t1 | 15.23 |
| 2021-01-01T00:00:50Z | t1 | 4.43 |

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t2 | 19.85 |
| 2021-01-01T00:00:10Z | t2 | 4.97 |
| 2021-01-01T00:00:20Z | t2 | -3.75 |
| 2021-01-01T00:00:30Z | t2 | 19.77 |
| 2021-01-01T00:00:40Z | t2 | 13.86 |
| 2021-01-01T00:00:50Z | t2 | 1.86 |

#### Output data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 0.11304153064044985 | t1 |
| 2021-01-01T00:00:10Z | 55270.798943169066 | t1 |
| 2021-01-01T00:00:20Z | 1556.1965278371533 | t1 |
| 2021-01-01T00:00:30Z | 41037629.64620374 | t1 |
| 2021-01-01T00:00:40Z | 4114385.297453036 | t1 |
| 2021-01-01T00:00:50Z | 83.93141691026881 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 417585553.5730289 | t2 |
| 2021-01-01T00:00:10Z | 144.02688737091955 | t2 |
| 2021-01-01T00:00:20Z | 0.023517745856009107 | t2 |
| 2021-01-01T00:00:30Z | 385480050.5181745 | t2 |
| 2021-01-01T00:00:40Z | 1045493.9383645338 | t2 |
| 2021-01-01T00:00:50Z | 6.423736771429135 | t2 |