> For the complete documentation index, see [llms.txt](https://docs.fractalworks.io/joule/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fractalworks.io/joule/components/analytics/analytic-tools/analytic-functions/stateful/rolling-sum.md).

# Rolling Sum

## Objective

Calculate the rolling sum of values across provided attributes.

## Example

```yaml
time window:
  emitting type: slidingRollingSum
    window fucntions:
    rolling volume:
      function:
        rolling sum: {}
      attributes: [ volume ]
  policy:
    type: slidingTime
    slide: 500
    window size: 2500
```

### Output attributes

After processing, attributes receive automatically applied postfix ID = `ROLLING_SUM`

| Before processing | After processing     | Type         |
| ----------------- | -------------------- | ------------ |
| volume            | volume\_ROLLING\_SUM | double value |