> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Appending fields

Appending a vector field to the end of the `Delta` store in the `Sensitivities` schema:

```Java theme={"languages":{"custom":["/engine/python-sdk/0.9/languages/pycon.tmLanguage.json"]}}
configurator.appendField("Sensitivities", "Delta", new CustomField("Interpolated Delta", ILiteralType.DOUBLE, new double[]{-1.0}).asVectorField().swap());
```