# Data Structures

When having a look at some previous examples, it might not be directly obvious, but we are actually not always working just with single values, such as a number. We also had a look at examples which are actually working with a multi-value set, such as when calculating an *average*. 

So each literal has not only a [Data Type](/platform-manual/rules/rule-language/data-types.md), but also a [Data Structure](/platform-manual/rules/rule-language/data-structures.md). Here you see the full list:

## Scalar

A single value is stored in a *Scalar* data structure. 

Generally all [values](/platform-manual/rules/rule-language/syntax.md#values) are Scalars, but you typically also get Scalars when evaluating boolean or arithmetic operations.

### Examples

```java
99.5
```

Example with `$PowerConsumption` with dataset of name *PowerConsumption* of type Single Value:

```java
AVG($PowerConsumption)
```

## **Vector**

 A set of values is stored in a Vector data structure.

Generally only [variables](/platform-manual/rules/rule-language/syntax.md#variables), or operations and functions on top of [variables](/platform-manual/rules/rule-language/syntax.md#variables), may produce Vectors.

### Examples:

Example with `$PowerConsumption` with dataset of name *PowerConsumption* of type Time Series:

```java
SUBSET($PowerConsumption, now-24h)
```

## **GroupedScalar**

A list of single values, grouped by device or time.

Generally only [variables](/platform-manual/rules/rule-language/syntax.md#variables) in combination with a `GROUP_BY_DEVICE` or `GROUP_BY_TIME` function may produce a GroupedScalar.

### Examples

```java
AVG(GROUP_BY_DEVICE($PowerConsumption)) with Dataset of name PowerConsumption with type Time Series
```

## **GroupedVector**

A list of list of value sets, grouped by device or time.

Generally only [variables](/platform-manual/rules/rule-language/syntax.md#variables) in combination with a `GROUP_BY_DEVICE` or `GROUP_BY_TIME` function may produce a GroupedVector.

### Examples

```java
GROUP_BY_DEVICE($PowerConsumption) with Dataset of name PowerConsumption with type Time Series
```


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