124 lines
3.5 KiB
Markdown
124 lines
3.5 KiB
Markdown
---
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title: math.asin() function
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description: >
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`math.asin()` returns the arcsine of `x` in radians.
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menu:
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flux_v0_ref:
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name: math.asin
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parent: math
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identifier: math/asin
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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#L198-L198
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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.asin()` returns the arcsine 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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`x` should be greater than -1 and less than 1. Otherwise the function will
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return `NaN`.
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## Examples
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- [Return the arcsine of a value](#return-the-arcsine-of-a-value)
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- [Use math.asin in map](#use-mathasin-in-map)
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### Return the arcsine of a value
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```js
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import "math"
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math.asin(x: 0.22)
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```
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### Use math.asin in map
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```js
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import "math"
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data
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|> map(fn: (r) => ({r with _value: math.asin(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 | -0.021800000000000003 |
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| 2021-01-01T00:00:10Z | t1 | 0.1092 |
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| 2021-01-01T00:00:20Z | t1 | 0.0735 |
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| 2021-01-01T00:00:30Z | t1 | 0.1753 |
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| 2021-01-01T00:00:40Z | t1 | 0.15230000000000002 |
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| 2021-01-01T00:00:50Z | t1 | 0.0443 |
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| _time | *tag | _value |
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| -------------------- | ---- | -------------------- |
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| 2021-01-01T00:00:00Z | t2 | 0.1985 |
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| 2021-01-01T00:00:10Z | t2 | 0.0497 |
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| 2021-01-01T00:00:20Z | t2 | -0.0375 |
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| 2021-01-01T00:00:30Z | t2 | 0.1977 |
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| 2021-01-01T00:00:40Z | t2 | 0.1386 |
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| 2021-01-01T00:00:50Z | t2 | 0.018600000000000002 |
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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 | -0.021801727074707577 | t1 |
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| 2021-01-01T00:00:10Z | 0.10941820137571553 | t1 |
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| 2021-01-01T00:00:20Z | 0.07356633896021608 | t1 |
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| 2021-01-01T00:00:30Z | 0.17621047844966892 | t1 |
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| 2021-01-01T00:00:40Z | 0.1528950055407725 | t1 |
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| 2021-01-01T00:00:50Z | 0.044314502528968014 | t1 |
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 0.1998272282367503 | t2 |
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| 2021-01-01T00:00:10Z | 0.04972048335509017 | t2 |
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| 2021-01-01T00:00:20Z | -0.03750879462898862 | t2 |
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| 2021-01-01T00:00:30Z | 0.19901105310181802 | t2 |
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| 2021-01-01T00:00:40Z | 0.13904763050983682 | t2 |
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| 2021-01-01T00:00:50Z | 0.0186010726429996 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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