> For the complete documentation index, see [llms.txt](https://docs.marpledata.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.marpledata.com/docs/marple-insight/user-manuals/analysis/functions.md).

# Functions

Beyond visualizing regular signals, Marple Insight allows you to apply functions to signals—or combinations of signals—to create custom variations. This is very powerful, as it enables you to perform calculations on the fly and tailor your data analysis to your needs, without modifying the original dataset.

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[Functions Overview](/docs/marple-insight/user-manuals/analysis/functions/functions-overview.md)
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[Built-in functions](/docs/marple-insight/user-manuals/analysis/functions/built-in-functions.md)
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[Custom functions](/docs/marple-insight/user-manuals/analysis/functions/custom-functions.md)
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