docs-v2/content/flux/v0.x/stdlib/math/atan.md

title	description	menu	weight
math.atan() function	`math.atan()` returns the arctangent of `x` in radians.	flux_0_x_ref name parent identifier math.atan math math/atan	101

math.atan() returns the arctangent of x in radians.

Function type signature

(x: float) => float

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

Parameters

x

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

Examples

• Return the arctangent of a value
• Use math.atan in map

Return the arctangent of a value

import "math"

math.atan(x: 3.14)// 1.262480664599468

Use math.atan in map

import "math"
import "sampledata"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.atan(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	-1.140718191739034	t1
2021-01-01T00:00:10Z	1.4794759377086963	t1
2021-01-01T00:00:20Z	1.4355721950708649	t1
2021-01-01T00:00:30Z	1.5138130181922385	t1
2021-01-01T00:00:40Z	1.5052305597197282	t1
2021-01-01T00:00:50Z	1.3487837105541014	t1

_time	_value	*tag
2021-01-01T00:00:00Z	1.5204610466686876	t2
2021-01-01T00:00:10Z	1.3722402258799695	t2
2021-01-01T00:00:20Z	-1.3101939350475555	t2
2021-01-01T00:00:30Z	1.520257709140084	t2
2021-01-01T00:00:40Z	1.4987710606562659	t2
2021-01-01T00:00:50Z	1.0774963946058176	t2

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