125 lines
3.1 KiB
Markdown
125 lines
3.1 KiB
Markdown
---
|
|
title: math.round() function
|
|
description: >
|
|
`math.round()` returns the nearest integer, rounding half away from zero.
|
|
menu:
|
|
flux_v0_ref:
|
|
name: math.round
|
|
parent: math
|
|
identifier: math/round
|
|
weight: 101
|
|
---
|
|
|
|
<!------------------------------------------------------------------------------
|
|
|
|
IMPORTANT: This page was generated from comments in the Flux source code. Any
|
|
edits made directly to this page will be overwritten the next time the
|
|
documentation is generated.
|
|
|
|
To make updates to this documentation, update the function comments above the
|
|
function definition in the Flux source code:
|
|
|
|
https://github.com/influxdata/flux/blob/master/stdlib/math/math.flux#L1900-L1900
|
|
|
|
Contributing to Flux: https://github.com/influxdata/flux#contributing
|
|
Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
|
|
|
|
------------------------------------------------------------------------------->
|
|
|
|
`math.round()` returns the nearest integer, rounding half away from zero.
|
|
|
|
|
|
|
|
##### 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
|
|
|
|
- [Round a value to the nearest whole number](#round-a-value-to-the-nearest-whole-number)
|
|
- [Use math.round in map](#use-mathround-in-map)
|
|
|
|
### Round a value to the nearest whole number
|
|
|
|
```js
|
|
import "math"
|
|
|
|
math.round(x: 2.12)// 2.0
|
|
|
|
|
|
```
|
|
|
|
|
|
### Use math.round in map
|
|
|
|
```js
|
|
import "math"
|
|
import "sampledata"
|
|
|
|
sampledata.float()
|
|
|> map(fn: (r) => ({r with _value: math.round(x: r._value)}))
|
|
|
|
```
|
|
|
|
{{< expand-wrapper >}}
|
|
{{% 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 | t1 |
|
|
| 2021-01-01T00:00:10Z | 11 | t1 |
|
|
| 2021-01-01T00:00:20Z | 7 | t1 |
|
|
| 2021-01-01T00:00:30Z | 18 | t1 |
|
|
| 2021-01-01T00:00:40Z | 15 | t1 |
|
|
| 2021-01-01T00:00:50Z | 4 | t1 |
|
|
|
|
| _time | _value | *tag |
|
|
| -------------------- | ------- | ---- |
|
|
| 2021-01-01T00:00:00Z | 20 | t2 |
|
|
| 2021-01-01T00:00:10Z | 5 | t2 |
|
|
| 2021-01-01T00:00:20Z | -4 | t2 |
|
|
| 2021-01-01T00:00:30Z | 20 | t2 |
|
|
| 2021-01-01T00:00:40Z | 14 | t2 |
|
|
| 2021-01-01T00:00:50Z | 2 | t2 |
|
|
|
|
{{% /expand %}}
|
|
{{< /expand-wrapper >}}
|