128 lines
3.5 KiB
Markdown
128 lines
3.5 KiB
Markdown
---
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title: math.float64frombits() function
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description: >
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`math.float64frombits()` returns the floating-point number corresponding to the IEE
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754 binary representation `b`, with the sign bit of `b` and the result in the
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same bit position.
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menu:
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flux_v0_ref:
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name: math.float64frombits
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parent: math
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identifier: math/float64frombits
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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#L882-L882
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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.float64frombits()` returns the floating-point number corresponding to the IEE
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754 binary representation `b`, with the sign bit of `b` and the result in the
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same bit position.
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##### Function type signature
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```js
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(b: uint) => 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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### b
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({{< req >}})
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Value to operate on.
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## Examples
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- [Convert bits into a float value](#convert-bits-into-a-float-value)
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- [Use math.float64frombits in map](#use-mathfloat64frombits-in-map)
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### Convert bits into a float value
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```js
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import "math"
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math.float64frombits(b: uint(v: 4))// 2e-323
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```
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### Use math.float64frombits 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) => ({r with _value: math.float64frombits(b: r._value)}))
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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 | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 13835463379248627057 | t1 |
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| 2021-01-01T00:00:10Z | 4622337031546119127 | t1 |
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| 2021-01-01T00:00:20Z | 4619961382742681190 | t1 |
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| 2021-01-01T00:00:30Z | 4625627474023866696 | t1 |
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| 2021-01-01T00:00:40Z | 4624763345845364982 | t1 |
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| 2021-01-01T00:00:50Z | 4616673755014700728 | t1 |
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| _time | _value | *tag |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | 4626280495969835418 | t2 |
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| 2021-01-01T00:00:10Z | 4617281740964395745 | t2 |
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| 2021-01-01T00:00:20Z | 13838998704956112896 | t2 |
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| 2021-01-01T00:00:30Z | 4626257977971698565 | t2 |
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| 2021-01-01T00:00:40Z | 4623992104409177784 | t2 |
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| 2021-01-01T00:00:50Z | 4611055514479556035 | t2 |
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#### Output data
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | -2.18 | t1 |
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| 2021-01-01T00:00:10Z | 10.92 | t1 |
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| 2021-01-01T00:00:20Z | 7.35 | t1 |
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| 2021-01-01T00:00:30Z | 17.53 | t1 |
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| 2021-01-01T00:00:40Z | 15.23 | t1 |
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| 2021-01-01T00:00:50Z | 4.43 | t1 |
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | 19.85 | t2 |
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| 2021-01-01T00:00:10Z | 4.97 | t2 |
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| 2021-01-01T00:00:20Z | -3.75 | t2 |
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| 2021-01-01T00:00:30Z | 19.77 | t2 |
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| 2021-01-01T00:00:40Z | 13.86 | t2 |
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| 2021-01-01T00:00:50Z | 1.86 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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