# Synthetic variables

- [Getting started](https://dev.ubidots.com/synthetic-variables/getting-started.md)
- [Creating synthetic variables](https://dev.ubidots.com/synthetic-variables/getting-started/creating-synthetic-variables.md)
- [Synthetic variables' editor](https://dev.ubidots.com/synthetic-variables/getting-started/synthetic-variables-editor.md)
- [Expressions](https://dev.ubidots.com/synthetic-variables/expressions.md)
- [Mathematical](https://dev.ubidots.com/synthetic-variables/expressions/mathematical.md)
- [Date range](https://dev.ubidots.com/synthetic-variables/expressions/date-range.md): Ubidots lets you build new variables from time-series data over a date range. For example, you can calculate the mean, sum, or median per hour using a synthetic variable based on your sensor inputs.
- [Rolling](https://dev.ubidots.com/synthetic-variables/expressions/rolling.md): Compute a rolling value over a time window or number of values using mean, sum, min, max, or count.
- [Special functions](https://dev.ubidots.com/synthetic-variables/expressions/special-functions.md): Use functions to work with time series, fill gaps in missing data, write conditional statements, compute cumulative sums, and shift values in a series.
- [Specs and limits](https://dev.ubidots.com/synthetic-variables/specs-and-limits.md): Synthetic variables have the following limits for performance and the coding environment.
- [Examples](https://dev.ubidots.com/synthetic-variables/examples.md): Here are some examples of how to use synthetic variables and its functions.
- [Mathematical](https://dev.ubidots.com/synthetic-variables/examples/mathematical.md)
- [Date range](https://dev.ubidots.com/synthetic-variables/examples/date-range.md)
- [Rolling](https://dev.ubidots.com/synthetic-variables/examples/rolling.md)
- [Special functions](https://dev.ubidots.com/synthetic-variables/examples/special-functions.md)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dev.ubidots.com/synthetic-variables.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.