---
title: math.abs() function
description: >
  `math.abs()` returns the absolute value of `x`.
menu:
  flux_v0_ref:
    name: math.abs
    parent: math
    identifier: math/abs
weight: 101
---

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`math.abs()` returns the absolute value of `x`.



##### Function type signature

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

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

## Parameters

### x
({{< req >}})
Value to operate on.




## Examples

- [Return the absolute value](#return-the-absolute-value)
- [Use math.abs in map](#use-mathabs-in-map)

### Return the absolute value

```js
math.abs(x: -1.22)// 1.22


```


### Use math.abs in map

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

```

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{{% expand "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 | 2.18    | t1   |
| 2021-01-01T00:00:10Z | 10.92   | t1   |
| 2021-01-01T00:00:20Z | 7.35    | t1   |
| 2021-01-01T00:00:30Z | 17.53   | t1   |
| 2021-01-01T00:00:40Z | 15.23   | t1   |
| 2021-01-01T00:00:50Z | 4.43    | t1   |

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

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