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 # dataChanged

 Last update: 30.07.2026 

abstract fun [dataChanged](data-changed.md)(varIndex: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html), runIndex: [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html))

Called by the Data Explorer to notify the plug-in that the data in the DataHistory has changed.

#### Parameters

varIndexThe index of the changed variablerunIndexThe index of the changed run