105 lines
2.7 KiB
Markdown
105 lines
2.7 KiB
Markdown
---
|
|
title: experimental.mean() function
|
|
description: >
|
|
`experimental.mean()` computes the mean or average of non-null values in the `_value` column
|
|
of each input table.
|
|
menu:
|
|
flux_v0_ref:
|
|
name: experimental.mean
|
|
parent: experimental
|
|
identifier: experimental/mean
|
|
weight: 101
|
|
flux/v0/tags: [transformations, aggregates]
|
|
introduced: 0.107.0
|
|
---
|
|
|
|
<!------------------------------------------------------------------------------
|
|
|
|
IMPORTANT: This page was generated from comments in the Flux source code. Any
|
|
edits made directly to this page will be overwritten the next time the
|
|
documentation is generated.
|
|
|
|
To make updates to this documentation, update the function comments above the
|
|
function definition in the Flux source code:
|
|
|
|
https://github.com/influxdata/flux/blob/master/stdlib/experimental/experimental.flux#L778-L778
|
|
|
|
Contributing to Flux: https://github.com/influxdata/flux#contributing
|
|
Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
|
|
|
|
------------------------------------------------------------------------------->
|
|
|
|
`experimental.mean()` computes the mean or average of non-null values in the `_value` column
|
|
of each input table.
|
|
|
|
Output tables contain a single row the with the calculated mean in the `_value` column.
|
|
|
|
##### Function type signature
|
|
|
|
```js
|
|
(<-tables: stream[{A with _value: float}]) => stream[{A with _value: float}]
|
|
```
|
|
|
|
{{% caption %}}
|
|
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
|
|
{{% /caption %}}
|
|
|
|
## Parameters
|
|
|
|
### tables
|
|
|
|
Input data. Default is piped-forward data (`<-`).
|
|
|
|
|
|
|
|
|
|
## Examples
|
|
|
|
### Calculate the average value of input tables
|
|
|
|
```js
|
|
import "experimental"
|
|
import "sampledata"
|
|
|
|
sampledata.float()
|
|
|> experimental.mean()
|
|
|
|
```
|
|
|
|
{{< expand-wrapper >}}
|
|
{{% expand "View example input and output" %}}
|
|
|
|
#### Input data
|
|
|
|
| _time | *tag | _value |
|
|
| -------------------- | ---- | ------- |
|
|
| 2021-01-01T00:00:00Z | t1 | -2.18 |
|
|
| 2021-01-01T00:00:10Z | t1 | 10.92 |
|
|
| 2021-01-01T00:00:20Z | t1 | 7.35 |
|
|
| 2021-01-01T00:00:30Z | t1 | 17.53 |
|
|
| 2021-01-01T00:00:40Z | t1 | 15.23 |
|
|
| 2021-01-01T00:00:50Z | t1 | 4.43 |
|
|
|
|
| _time | *tag | _value |
|
|
| -------------------- | ---- | ------- |
|
|
| 2021-01-01T00:00:00Z | t2 | 19.85 |
|
|
| 2021-01-01T00:00:10Z | t2 | 4.97 |
|
|
| 2021-01-01T00:00:20Z | t2 | -3.75 |
|
|
| 2021-01-01T00:00:30Z | t2 | 19.77 |
|
|
| 2021-01-01T00:00:40Z | t2 | 13.86 |
|
|
| 2021-01-01T00:00:50Z | t2 | 1.86 |
|
|
|
|
|
|
#### Output data
|
|
|
|
| *tag | _value |
|
|
| ---- | ------- |
|
|
| t1 | 8.88 |
|
|
|
|
| *tag | _value |
|
|
| ---- | ----------------- |
|
|
| t2 | 9.426666666666668 |
|
|
|
|
{{% /expand %}}
|
|
{{< /expand-wrapper >}}
|