Jacobian Logging and Analysis

The Solver Profiler supports Jacobian logging and analysis for implicit solvers.

Open the ssc_pneumatic_actuator model, click Debug, select Solver Profiler from the Performance Advisor drop down menu.

You can select the Model Jacobian check box in the Solver Profiler to log updates to the Jacobian matrix for the model. When you run the Solver Profiler on a model, you can see the logs in the Jacobian Analysis tab. Click Run to start simulation.

The Jacobian Analysis tab indicates the states in the model that are likely slowing down the solver.

Once the simulation completes, you should be able to find the logs in the Jacobian Analysis tab in the Suggestion Pane. The Jacobian Analysis tab indicates the states in the model that are likely slowing down the solver.

If you select Jacobian Update from the View section of the toolstrip, you will see that the Jacobian updates are displayed on the Step Size plot as black dots.

The log shows 448 Jacobian updates in total. To highlight the target block in the model, select a row of the table in the select a row in the Jacobian Analysis tab and click Highlight Block. The information displayed should be helpful to investigate the cause of each limiting state.