146 lines
3.7 KiB
Markdown
146 lines
3.7 KiB
Markdown
---
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title: float() function
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description: >
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`float()` converts a value to a float type.
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menu:
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flux_v0_ref:
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name: float
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parent: universe
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identifier: universe/float
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weight: 101
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flux/v0/tags: [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#L3254-L3254
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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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`float()` converts a value to a float type.
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##### Function type signature
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```js
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(v: A) => 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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### v
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({{< req >}})
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Value to convert.
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## Examples
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- [Convert a string to a float](#convert-a-string-to-a-float)
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- [Convert a scientific notation string to a float](#convert-a-scientific-notation-string-to-a-float)
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- [Convert an integer to a float](#convert-an-integer-to-a-float)
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- [Convert all values in a column to floats](#convert-all-values-in-a-column-to-floats)
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### Convert a string to a float
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```js
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float(v: "3.14")// Returns 3.14
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```
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### Convert a scientific notation string to a float
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```js
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float(v: "1.23e+20")// Returns 1.23e+20 (float)
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```
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### Convert an integer to a float
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```js
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float(v: "10")// Returns 10.0
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```
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### Convert all values in a column to floats
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If converting the `_value` column to float types, use `toFloat()`.
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If converting columns other than `_value`, use `map()` to iterate over each
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row and `float()` to convert a column value to a float type.
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```js
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data
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|> map(fn: (r) => ({r with exampleCol: float(v: r.exampleCol)}))
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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 | exampleCol | *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 | exampleCol | *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 | exampleCol | *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 | exampleCol | *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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