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math.atan() function

content/flux/v0/stdlib/math/atan.md

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<!------------------------------------------------------------------------------ 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#L263-L263 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

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

Function type signature
js
(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

js
import "math"

math.atan(x: 3.14)// 1.262480664599468

Use math.atan in map

js
import "math"
import "sampledata"

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

{{< expand-wrapper >}} {{% expand "View example input and output" %}}

Input data

_time*tag_value
2021-01-01T00:00:00Zt1-2.18
2021-01-01T00:00:10Zt110.92
2021-01-01T00:00:20Zt17.35
2021-01-01T00:00:30Zt117.53
2021-01-01T00:00:40Zt115.23
2021-01-01T00:00:50Zt14.43
_time*tag_value
2021-01-01T00:00:00Zt219.85
2021-01-01T00:00:10Zt24.97
2021-01-01T00:00:20Zt2-3.75
2021-01-01T00:00:30Zt219.77
2021-01-01T00:00:40Zt213.86
2021-01-01T00:00:50Zt21.86

Output data

_time_value*tag
2021-01-01T00:00:00Z-1.140718191739034t1
2021-01-01T00:00:10Z1.4794759377086963t1
2021-01-01T00:00:20Z1.4355721950708649t1
2021-01-01T00:00:30Z1.5138130181922385t1
2021-01-01T00:00:40Z1.5052305597197282t1
2021-01-01T00:00:50Z1.3487837105541014t1
_time_value*tag
2021-01-01T00:00:00Z1.5204610466686876t2
2021-01-01T00:00:10Z1.3722402258799695t2
2021-01-01T00:00:20Z-1.3101939350475555t2
2021-01-01T00:00:30Z1.520257709140084t2
2021-01-01T00:00:40Z1.4987710606562659t2
2021-01-01T00:00:50Z1.0774963946058176t2

{{% /expand %}} {{< /expand-wrapper >}}