Runtime Updating Variables
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This section will describe how to update variables while a flowgraph is running using QT GUI Widgets. Please review the previous tutorial, Variables in Flowgraphs, for an introduction to variables.
QT GUI Range
The GNU Radio block library comes with a handful of QT GUI widgets which allow a user to interact and change a flowgraph while it is running. The QT GUI Range creates a slider bar that can be used to update a variable.
Search for range in the block library:
TODO: using other QT blocks