docs-v2/content/flux/v0/stdlib/math/yn.md

title	description	menu	weight
math.yn() function	`math.yn()` returns the order-n Bessel function of the second kind.	flux_v0_ref name parent identifier math.yn math math/yn	101

math.yn() returns the order-n Bessel function of the second kind.

Function type signature

(n: int, x: float) => float

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Parameters

n

({{< req >}}) Order number to use in the operation.

x

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

Examples

• Return the order-n Bessel function of a value
• Use math.yn in map

Return the order-n Bessel function of a value

import "math"

math.yn(n: 3, x: 3.14)// -0.4866506930335083

Use math.yn in map

import "math"

data
    |> map(fn: (r) => ({_time: r._time, _value: math.yn(n: r.n, x: r.x)}))

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Input data

_time	x	n
2021-01-01T00:00:00Z	1.2	3
2021-01-01T01:00:00Z	2.4	4
2021-01-01T02:00:00Z	3.6	5
2021-01-01T03:00:00Z	4.8	6
2021-01-01T04:00:00Z	5.1	7

Output data

_time	_value
2021-01-01T00:00:00Z	-3.589899629613186
2021-01-01T01:00:00Z	-1.6023565737844263
2021-01-01T02:00:00Z	-1.0581497196727103
2021-01-01T03:00:00Z	-0.8050704522628885
2021-01-01T04:00:00Z	-1.1643613692219157

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