176 lines
4.8 KiB
Markdown
176 lines
4.8 KiB
Markdown
---
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title: toFloat() function
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description: >
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`toFloat()` converts all values in the `_value` column to float types.
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menu:
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flux_v0_ref:
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name: toFloat
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parent: universe
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identifier: universe/toFloat
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weight: 101
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flux/v0/tags: [transformations, type-conversions]
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introduced: 0.7.0
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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/universe/universe.flux#L4751-L4751
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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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`toFloat()` converts all values in the `_value` column to float types.
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#### Supported data types
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- string (numeric, scientific notation, ±Inf, or NaN)
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- boolean
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- int
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- uint
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##### Function type signature
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```js
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(<-tables: stream[{A with _value: B}]) => stream[{A with _value: B, _value: 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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### tables
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Input data. Default is piped-forward data (`<-`).
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## Examples
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- [Convert an integer _value column to floats](#convert-an-integer-_value-column-to-floats)
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- [Convert a boolean _value column to floats](#convert-a-boolean-_value-column-to-floats)
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### Convert an integer _value column to floats
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```js
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import "sampledata"
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sampledata.int()
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|> toFloat()
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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 | -2 | t1 |
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| 2021-01-01T00:00:10Z | 10 | t1 |
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| 2021-01-01T00:00:20Z | 7 | t1 |
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| 2021-01-01T00:00:30Z | 17 | t1 |
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| 2021-01-01T00:00:40Z | 15 | t1 |
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| 2021-01-01T00:00:50Z | 4 | t1 |
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | 19 | t2 |
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| 2021-01-01T00:00:10Z | 4 | t2 |
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| 2021-01-01T00:00:20Z | -3 | t2 |
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| 2021-01-01T00:00:30Z | 19 | t2 |
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| 2021-01-01T00:00:40Z | 13 | t2 |
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| 2021-01-01T00:00:50Z | 1 | 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 | t1 |
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| 2021-01-01T00:00:10Z | 10 | t1 |
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| 2021-01-01T00:00:20Z | 7 | t1 |
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| 2021-01-01T00:00:30Z | 17 | t1 |
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| 2021-01-01T00:00:40Z | 15 | t1 |
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| 2021-01-01T00:00:50Z | 4 | t1 |
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | 19 | t2 |
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| 2021-01-01T00:00:10Z | 4 | t2 |
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| 2021-01-01T00:00:20Z | -3 | t2 |
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| 2021-01-01T00:00:30Z | 19 | t2 |
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| 2021-01-01T00:00:40Z | 13 | t2 |
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| 2021-01-01T00:00:50Z | 1 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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### Convert a boolean _value column to floats
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```js
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import "sampledata"
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sampledata.bool()
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|> toFloat()
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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 | true |
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| 2021-01-01T00:00:10Z | t1 | true |
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| 2021-01-01T00:00:20Z | t1 | false |
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| 2021-01-01T00:00:30Z | t1 | true |
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| 2021-01-01T00:00:40Z | t1 | false |
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| 2021-01-01T00:00:50Z | t1 | false |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t2 | false |
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| 2021-01-01T00:00:10Z | t2 | true |
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| 2021-01-01T00:00:20Z | t2 | false |
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| 2021-01-01T00:00:30Z | t2 | true |
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| 2021-01-01T00:00:40Z | t2 | true |
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| 2021-01-01T00:00:50Z | t2 | false |
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#### Output data
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t1 | 1 |
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| 2021-01-01T00:00:10Z | t1 | 1 |
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| 2021-01-01T00:00:20Z | t1 | 0 |
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| 2021-01-01T00:00:30Z | t1 | 1 |
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| 2021-01-01T00:00:40Z | t1 | 0 |
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| 2021-01-01T00:00:50Z | t1 | 0 |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2021-01-01T00:00:00Z | t2 | 0 |
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| 2021-01-01T00:00:10Z | t2 | 1 |
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| 2021-01-01T00:00:20Z | t2 | 0 |
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| 2021-01-01T00:00:30Z | t2 | 1 |
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| 2021-01-01T00:00:40Z | t2 | 1 |
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| 2021-01-01T00:00:50Z | t2 | 0 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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