docs-v2/content/flux/v0/stdlib/internal/promql/quantile.md

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---
title: promql.quantile() function
description: >
`promql.quantile()` accounts checks for quantile values that are out of range, above 1.0 or
below 0.0, by either returning positive infinity or negative infinity in the `_value`
column respectively. `q` must be a float.
menu:
flux_v0_ref:
name: promql.quantile
parent: internal/promql
identifier: internal/promql/quantile
weight: 201
---
<!------------------------------------------------------------------------------
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function definition in the Flux source code:
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`promql.quantile()` accounts checks for quantile values that are out of range, above 1.0 or
below 0.0, by either returning positive infinity or negative infinity in the `_value`
column respectively. `q` must be a float.
**Important**: The `internal/promql` package is not meant for external use.
##### Function type signature
```js
(<-tables: stream[A], q: float, ?method: string) => stream[A] where A: Record
```
{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}
## Parameters
### tables
Input data. Default is piped-forward data (`<-`).
### q
({{< req >}})
Quantile to compute (`[0.0 - 1.0]`).
### method
Quantile method to use.