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

title	description	menu	weight
math.sqrt() function	`math.sqrt()` returns the square root of `x`.	flux_v0_ref name parent identifier math.sqrt math math/sqrt	101

math.sqrt() returns the square root of x.

Function type signature

(x: float) => float

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Parameters

x

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

Examples

• Return the square root of a value
• Use math.sqrt in map

Return the square root of a value

import "math"

math.sqrt(x: 4.0)// 2.0

Use math.sqrt in map

import "math"
import "sampledata"

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

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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	NaN	t1
2021-01-01T00:00:10Z	3.304542328371661	t1
2021-01-01T00:00:20Z	2.711088342345192	t1
2021-01-01T00:00:30Z	4.186884283091665	t1
2021-01-01T00:00:40Z	3.9025632602175713	t1
2021-01-01T00:00:50Z	2.1047565179849186	t1

_time	_value	*tag
2021-01-01T00:00:00Z	4.455333881989093	t2
2021-01-01T00:00:10Z	2.2293496809607953	t2
2021-01-01T00:00:20Z	NaN	t2
2021-01-01T00:00:30Z	4.446346815083142	t2
2021-01-01T00:00:40Z	3.722902093797257	t2
2021-01-01T00:00:50Z	1.3638181696985856	t2

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