125 lines
3.2 KiB
Markdown
125 lines
3.2 KiB
Markdown
---
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title: math.atan() function
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description: >
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`math.atan()` returns the arctangent of `x` in radians.
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menu:
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flux_v0_ref:
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name: math.atan
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parent: math
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identifier: math/atan
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weight: 101
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---
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<!------------------------------------------------------------------------------
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IMPORTANT: This page was generated from comments in the Flux source code. Any
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edits made directly to this page will be overwritten the next time the
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documentation is generated.
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To make updates to this documentation, update the function comments above the
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function definition in the Flux source code:
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https://github.com/influxdata/flux/blob/master/stdlib/math/math.flux#L263-L263
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Contributing to Flux: https://github.com/influxdata/flux#contributing
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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
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------------------------------------------------------------------------------->
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`math.atan()` returns the arctangent of `x` in radians.
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##### Function type signature
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```js
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(x: float) => float
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```
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{{% caption %}}
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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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{{% /caption %}}
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## Parameters
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### x
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({{< req >}})
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Value to operate on.
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## Examples
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- [Return the arctangent of a value](#return-the-arctangent-of-a-value)
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- [Use math.atan in map](#use-mathatan-in-map)
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### Return the arctangent of a value
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```js
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import "math"
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math.atan(x: 3.14)// 1.262480664599468
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```
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### Use math.atan in map
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```js
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import "math"
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import "sampledata"
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sampledata.float()
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|> map(fn: (r) => ({r with _value: math.atan(x: r._value)}))
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```
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{{< expand-wrapper >}}
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{{% expand "View example input and output" %}}
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#### Input data
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t1 | -2.18 |
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| 2021-01-01T00:00:10Z | t1 | 10.92 |
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| 2021-01-01T00:00:20Z | t1 | 7.35 |
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| 2021-01-01T00:00:30Z | t1 | 17.53 |
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| 2021-01-01T00:00:40Z | t1 | 15.23 |
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| 2021-01-01T00:00:50Z | t1 | 4.43 |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t2 | 19.85 |
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| 2021-01-01T00:00:10Z | t2 | 4.97 |
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| 2021-01-01T00:00:20Z | t2 | -3.75 |
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| 2021-01-01T00:00:30Z | t2 | 19.77 |
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| 2021-01-01T00:00:40Z | t2 | 13.86 |
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| 2021-01-01T00:00:50Z | t2 | 1.86 |
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#### Output data
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| _time | _value | *tag |
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| -------------------- | ------------------ | ---- |
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| 2021-01-01T00:00:00Z | -1.140718191739034 | t1 |
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| 2021-01-01T00:00:10Z | 1.4794759377086963 | t1 |
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| 2021-01-01T00:00:20Z | 1.4355721950708649 | t1 |
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| 2021-01-01T00:00:30Z | 1.5138130181922385 | t1 |
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| 2021-01-01T00:00:40Z | 1.5052305597197282 | t1 |
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| 2021-01-01T00:00:50Z | 1.3487837105541014 | t1 |
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| _time | _value | *tag |
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| -------------------- | ------------------- | ---- |
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| 2021-01-01T00:00:00Z | 1.5204610466686876 | t2 |
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| 2021-01-01T00:00:10Z | 1.3722402258799695 | t2 |
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| 2021-01-01T00:00:20Z | -1.3101939350475555 | t2 |
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| 2021-01-01T00:00:30Z | 1.520257709140084 | t2 |
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| 2021-01-01T00:00:40Z | 1.4987710606562659 | t2 |
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| 2021-01-01T00:00:50Z | 1.0774963946058176 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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