> For the complete documentation index, see [llms.txt](https://doc.moost.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.moost.io/platform-manual/rules/rule-language/functions/avg-1.md).

# EVAL

### Description

Evaluates the `buildingSelector` for the given `datasetName` and returns a `GroupedVector`, where:

* The **key** is the `customerBuildingId`.
* The **value** is a `Vector` containing all event values from the dataset, grouped by `customerBuildingId`.

### EVAL(Text, AttributeOperator)

```java
POSITION(datasetName: Text, buildingSelector: AttributeOperator): GroupedVector<Text, Vector<Number>>
```

#### Parameters

<table><thead><tr><th width="172">Parameter</th><th>Description</th></tr></thead><tbody><tr><td>datasetName</td><td>The datasetName for which we want to load all events for the buildings specified by the buildingSelector.</td></tr><tr><td>buildingSelector</td><td><p>The buildingSelector as AttributeOperator which specifies for which buildings we want to load the events specified by datasetName. Valid values are:<br></p><pre><code>Building::IsSelfSufficiencyMotivated
Building::IsEcologicalMotivated
Building::IsSelfSufficiencyMotivated
Building::IsMultiPerson
Building::IsSinglePerson
Building::IsResidential
Building::IsCommercial
Building::IsInSameCountry
Building::IsInSameElcomCategory
Building::IsInSameBepSubgroup
Building::All
</code></pre></td></tr></tbody></table>

#### Returns

Returns a `GroupedVector` where:

* The **key** is the `customerBuildingId`.
* The **values** are vectors containing event values, grouped by household as specified in `datasetName`.


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