Want to remove unused data/event from Stateflow

Hi Friends,

I want to remove the data/events declared in Stateflow in model properties (data dictionary) but not used in the logic. I know the M script command to get all the data/event declared in data dictionary but don't know how to find out whether it is used in Stateflow or not.

Is there any particular property to find it out. Please provide your suggestion on how to automate it.

Answer 1

[Michelle Wu]

Stateflow can detect unused data, events, messages, and functions when the corresponding diagnostic is set to 'warning' or 'error'. However, please note that the diagnostic is only performed during a model update of the Stateflow Chart. If a Chart has not changed since a previous model update, the Chart will not be analyzed again, and as such the diagnostics are not shown. Please refer to the following documentation for more information:

http://www.mathworks.com/help/simulink/gui/unused-data-events-and-messages.html

It seems that the Stateflow API is not capable of directly removing these unused data or events. The only possible workaround you could try is to first let Simulink detect unused data and events, and then report the diagnostic messages programmatically. Afterwards, you might parse the error messages and remove those accordingly. The following documentation could be helpful:

http://www.mathworks.com/help/simulink/ug/programmatically-report-diagnostic-messages-in-diagnostic-viewer.html

[Vivek]

Thanks. Actually it can be done by obtaining LabelString of all transitions and check the variable name against it. But I'm looking for some simpler solution.