112 lines
2.6 KiB
Markdown
112 lines
2.6 KiB
Markdown
---
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title: math.nextafter() function
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description: >
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`math.nextafter()` returns the next representable float value after `x` towards `y`.
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menu:
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flux_v0_ref:
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name: math.nextafter
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parent: math
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identifier: math/nextafter
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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#L1741-L1741
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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.nextafter()` returns the next representable float value after `x` towards `y`.
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##### Function type signature
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```js
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(x: float, y: 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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x-value to use in the operation.
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### y
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({{< req >}})
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y-value to use in the operation.
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## Examples
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- [Return the next possible float value](#return-the-next-possible-float-value)
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- [Use math.nextafter in map](#use-mathnextafter-in-map)
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### Return the next possible float value
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```js
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import "math"
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math.nextafter(x: 1.23, y: 4.56)// 1.2300000000000002
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```
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### Use math.nextafter 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.nextafter(x: r.t1, y: r.t2)}))
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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 | t1 | t2 |
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| -------------------- | ----- | ----- |
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| 2021-01-01T00:00:00Z | -2.18 | 19.85 |
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| 2021-01-01T00:00:10Z | 10.92 | 4.97 |
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| 2021-01-01T00:00:20Z | 7.35 | -3.75 |
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| 2021-01-01T00:00:30Z | 17.53 | 19.77 |
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| 2021-01-01T00:00:40Z | 15.23 | 13.86 |
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| 2021-01-01T00:00:50Z | 4.43 | 1.86 |
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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 | -2.1799999999999997 |
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| 2021-01-01T00:00:10Z | 10.919999999999998 |
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| 2021-01-01T00:00:20Z | 7.349999999999999 |
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| 2021-01-01T00:00:30Z | 17.530000000000005 |
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| 2021-01-01T00:00:40Z | 15.229999999999999 |
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| 2021-01-01T00:00:50Z | 4.429999999999999 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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