110 lines
2.4 KiB
Markdown
110 lines
2.4 KiB
Markdown
---
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title: math.yn() function
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description: >
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`math.yn()` returns the order-n Bessel function of the second kind.
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menu:
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flux_v0_ref:
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name: math.yn
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parent: math
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identifier: math/yn
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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#L2313-L2313
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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.yn()` returns the order-n Bessel function of the second kind.
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##### Function type signature
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```js
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(n: int, 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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### n
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({{< req >}})
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Order number to use in the operation.
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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 order-n Bessel function of a value](#return-the-order-n-bessel-function-of-a-value)
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- [Use math.yn in map](#use-mathyn-in-map)
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### Return the order-n Bessel function of a value
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```js
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import "math"
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math.yn(n: 3, x: 3.14)// -0.4866506930335083
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```
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### Use math.yn 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) => ({_time: r._time, _value: math.yn(n: r.n, x: r.x)}))
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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 | x | n |
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| -------------------- | --- | -- |
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| 2021-01-01T00:00:00Z | 1.2 | 3 |
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| 2021-01-01T01:00:00Z | 2.4 | 4 |
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| 2021-01-01T02:00:00Z | 3.6 | 5 |
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| 2021-01-01T03:00:00Z | 4.8 | 6 |
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| 2021-01-01T04:00:00Z | 5.1 | 7 |
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#### Output data
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| _time | _value |
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| -------------------- | ------------------- |
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| 2021-01-01T00:00:00Z | -3.589899629613186 |
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| 2021-01-01T01:00:00Z | -1.6023565737844263 |
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| 2021-01-01T02:00:00Z | -1.0581497196727103 |
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| 2021-01-01T03:00:00Z | -0.8050704522628885 |
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| 2021-01-01T04:00:00Z | -1.1643613692219157 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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