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math.yn() function

content/flux/v0/stdlib/math/yn.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#L2313-L2313 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

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

Function type signature
js
(n: int, x: float) => float

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

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

js
import "math"

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

Use math.yn in map

js
import "math"

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

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

Input data

_timexn
2021-01-01T00:00:00Z1.23
2021-01-01T01:00:00Z2.44
2021-01-01T02:00:00Z3.65
2021-01-01T03:00:00Z4.86
2021-01-01T04:00:00Z5.17

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

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