128 lines
3.4 KiB
Markdown
128 lines
3.4 KiB
Markdown
---
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title: math.modf() function
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description: >
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`math.modf()` returns integer and fractional floating-point numbers that sum to `f`.
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menu:
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flux_v0_ref:
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name: math.modf
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parent: math
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identifier: math/modf
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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#L1691-L1691
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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.modf()` returns integer and fractional floating-point numbers that sum to `f`.
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Both values have the same sign as `f`.
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##### Function type signature
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```js
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(f: float) => {int: float, frac: 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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### f
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({{< req >}})
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Value to operate on.
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## Examples
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- [Return the integer and float that sum to a value](#return-the-integer-and-float-that-sum-to-a-value)
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- [Use math.modf in map](#use-mathmodf-in-map)
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### Return the integer and float that sum to a value
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```js
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import "math"
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math.modf(f: 3.14)// {frac: 0.14000000000000012, int: 3}
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```
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### Use math.modf in map
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```js
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import "math"
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import "sampledata"
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sampledata.float()
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|> map(
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fn: (r) => {
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result = math.modf(f: r._value)
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return {_time: r._time, int: result.int, frac: result.frac}
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},
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)
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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 | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t1 | -2.18 |
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| 2021-01-01T00:00:10Z | t1 | 10.92 |
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| 2021-01-01T00:00:20Z | t1 | 7.35 |
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| 2021-01-01T00:00:30Z | t1 | 17.53 |
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| 2021-01-01T00:00:40Z | t1 | 15.23 |
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| 2021-01-01T00:00:50Z | t1 | 4.43 |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t2 | 19.85 |
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| 2021-01-01T00:00:10Z | t2 | 4.97 |
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| 2021-01-01T00:00:20Z | t2 | -3.75 |
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| 2021-01-01T00:00:30Z | t2 | 19.77 |
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| 2021-01-01T00:00:40Z | t2 | 13.86 |
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| 2021-01-01T00:00:50Z | t2 | 1.86 |
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#### Output data
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| _time | frac | int |
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| -------------------- | -------------------- | ---- |
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| 2021-01-01T00:00:00Z | -0.18000000000000016 | -2 |
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| 2021-01-01T00:00:10Z | 0.9199999999999999 | 10 |
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| 2021-01-01T00:00:20Z | 0.34999999999999964 | 7 |
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| 2021-01-01T00:00:30Z | 0.5300000000000011 | 17 |
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| 2021-01-01T00:00:40Z | 0.23000000000000043 | 15 |
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| 2021-01-01T00:00:50Z | 0.4299999999999997 | 4 |
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| 2021-01-01T00:00:00Z | 0.8500000000000014 | 19 |
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| 2021-01-01T00:00:10Z | 0.9699999999999998 | 4 |
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| 2021-01-01T00:00:20Z | -0.75 | -3 |
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| 2021-01-01T00:00:30Z | 0.7699999999999996 | 19 |
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| 2021-01-01T00:00:40Z | 0.8599999999999994 | 13 |
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| 2021-01-01T00:00:50Z | 0.8600000000000001 | 1 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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