---
title: promql.holtWinters() function
description: promql.holtWinters() implements functionality equivalent to PromQL’s holt_winters() function.
url: https://docs.influxdata.com/flux/v0/stdlib/internal/promql/holtwinters/
estimated_tokens: 598
product: Flux
version: v0
---

# promql.holtWinters() function

-   Flux 0.47.0+
-   View InfluxDB support

`promql.holtWinters()` implements functionality equivalent to [PromQL’s `holt_winters()` function](https://prometheus.io/docs/prometheus/latest/querying/functions/#holt_winters).

**Important**: The `internal/promql` package is not meant for external use.

##### Function type signature

```js
(
    <-tables: stream[{A with _value: float, _time: time}],
    ?smoothingFactor: float,
    ?trendFactor: float,
) => stream[{B with _value: float}]
```

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

## Parameters

### tables

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

### smoothingFactor

Exponential smoothing factor.

### trendFactor

Trend factor.