---
title: experimental.spread() function
description: >
  `experimental.spread()` returns the difference between the minimum and maximum values in the
  `_value` column for each input table.
menu:
  flux_v0_ref:
    name: experimental.spread
    parent: experimental
    identifier: experimental/spread
weight: 101
flux/v0/tags: [transformations, aggregates]
introduced: 0.107.0
---

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`experimental.spread()` returns the difference between the minimum and maximum values in the
`_value` column for each input table.



##### Function type signature

```js
(<-tables: stream[{A with _value: B}]) => stream[{A with _value: B}] where B: Numeric
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Return the difference between minimum and maximum values

```js
import "experimental"
import "sampledata"

sampledata.float()
    |> experimental.spread()

```

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{{% 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   | 19.71   |

| *tag | _value  |
| ---- | ------- |
| t2   | 23.6    |

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{{< /expand-wrapper >}}