You can start the debugger from either a Simulink® model window or from the MATLAB® Command Window.
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In a model window, select Simulation > Debug > Debug Model.
The debugger graphical user interface opens. See Debugger Graphical User Interface.
Continue selecting toolbar buttons.
Note: When running the debugger in graphical user interface (GUI) mode, you must explicitly start the simulation. For more information, see Start a Simulation.
In the MATLAB Command Window, enter either
the sim command. For example, enter
sim('vdp', 'StopTime', '10', 'debug', 'on')
or the sldebug command. For example, enter
In both cases, the example model vdp loads into memory, starts the simulation, and stops the simulation at the first block in the model execution list.
The debugger opens and a debugger command prompt appears within the MATLAB command window. Continue entering debugger commands at this debugger prompt.