Introduction to the Debugger

With the debugger, you run your simulation method by method. You can stop after each method to examine the execution results. In this way, you can pinpoint problems in your model to specific blocks, parameters, or interconnections.


Methods are functions that the Simulink® software uses to solve a model at each time step during the simulation. Blocks are made up of multiple methods. “Block execution” in this documentation is shorthand for “block methods execution.” Block diagram execution is a multi-step operation that requires execution of the different block methods in all the blocks in a diagram at various points during the process of solving a model at each time step during simulation, as specified by the simulation loop.

The debugger has both a graphical and a command-line user interface. The graphical interface allows you to access the most commonly used features of the debugger. The command-line interface gives you access to all of the capabilities in the debugger. If you can use either to perform a task, the documentation shows you first how to use the graphical interface, Debugger Graphical User Interface, and then the command-line interface, Debugger Command-Line Interface.

All functions such as atrace and ashow can only be used within the debugger.

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