---
title: math.mInf() function
description: >
  `math.mInf()` returns positive infinity if `sign >= 0`, negative infinity
  if `sign < 0`.
menu:
  flux_v0_ref:
    name: math.mInf
    parent: math
    identifier: math/mInf
weight: 101
---

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`math.mInf()` returns positive infinity if `sign >= 0`, negative infinity
if `sign < 0`.



##### Function type signature

```js
(sign: int) => float
```

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

## Parameters

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




## Examples

- [Return an infinity float value from a positive or negative sign value](#return-an-infinity-float-value-from-a-positive-or-negative-sign-value)
- [Use math.mInf in map](#use-mathminf-in-map)

### Return an infinity float value from a positive or negative sign value

```js
import "math"

math.mInf(sign: 1)// +Inf


```


### Use math.mInf in map

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

sampledata.int()
    |> map(fn: (r) => ({r with _value: math.mInf(sign: r._value)}))

```

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{{% expand "View example input and output" %}}

#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -Inf    | t1   |
| 2021-01-01T00:00:10Z | +Inf    | t1   |
| 2021-01-01T00:00:20Z | +Inf    | t1   |
| 2021-01-01T00:00:30Z | +Inf    | t1   |
| 2021-01-01T00:00:40Z | +Inf    | t1   |
| 2021-01-01T00:00:50Z | +Inf    | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | +Inf    | t2   |
| 2021-01-01T00:00:10Z | +Inf    | t2   |
| 2021-01-01T00:00:20Z | -Inf    | t2   |
| 2021-01-01T00:00:30Z | +Inf    | t2   |
| 2021-01-01T00:00:40Z | +Inf    | t2   |
| 2021-01-01T00:00:50Z | +Inf    | t2   |

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{{< /expand-wrapper >}}