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

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

math.asin() returns the arcsine 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.

x should be greater than -1 and less than 1. Otherwise the function will return NaN.

Examples

• Return the arcsine of a value
• Use math.asin in map

Return the arcsine of a value

import "math"

math.asin(x: 0.22)

Use math.asin in map

import "math"

data
    |> map(fn: (r) => ({r with _value: math.asin(x: r._value)}))

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Input data

_time	*tag	_value
2021-01-01T00:00:00Z	t1	-0.021800000000000003
2021-01-01T00:00:10Z	t1	0.1092
2021-01-01T00:00:20Z	t1	0.0735
2021-01-01T00:00:30Z	t1	0.1753
2021-01-01T00:00:40Z	t1	0.15230000000000002
2021-01-01T00:00:50Z	t1	0.0443

_time	*tag	_value
2021-01-01T00:00:00Z	t2	0.1985
2021-01-01T00:00:10Z	t2	0.0497
2021-01-01T00:00:20Z	t2	-0.0375
2021-01-01T00:00:30Z	t2	0.1977
2021-01-01T00:00:40Z	t2	0.1386
2021-01-01T00:00:50Z	t2	0.018600000000000002

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	-0.021801727074707577	t1
2021-01-01T00:00:10Z	0.10941820137571553	t1
2021-01-01T00:00:20Z	0.07356633896021608	t1
2021-01-01T00:00:30Z	0.17621047844966892	t1
2021-01-01T00:00:40Z	0.1528950055407725	t1
2021-01-01T00:00:50Z	0.044314502528968014	t1

_time	_value	*tag
2021-01-01T00:00:00Z	0.1998272282367503	t2
2021-01-01T00:00:10Z	0.04972048335509017	t2
2021-01-01T00:00:20Z	-0.03750879462898862	t2
2021-01-01T00:00:30Z	0.19901105310181802	t2
2021-01-01T00:00:40Z	0.13904763050983682	t2
2021-01-01T00:00:50Z	0.0186010726429996	t2

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