docs-v2/content/flux/v0/stdlib/math/round.md

title	description	menu	weight
math.round() function	`math.round()` returns the nearest integer, rounding half away from zero.	flux_v0_ref name parent identifier math.round math math/round	101

math.round() returns the nearest integer, rounding half away from zero.

Function type signature

(x: float) => float

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

Parameters

x

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

Examples

• Round a value to the nearest whole number
• Use math.round in map

Round a value to the nearest whole number

import "math"

math.round(x: 2.12)// 2.0

Use math.round in map

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 >}}