Explicit solver used in model containing Physical Networks blocks

Option to issue warning or error if model uses explicit solver for simulation

Model Configuration Pane: Simscape

Description

When a model contains Simscape™ blocks and you choose an explicit solver, such as ode45, simulation performance may not be optimal. Implicit solvers are better for most physical simulations. For more information about implicit solvers and physical systems, see Important Concepts and Choices in Physical Simulation.

By default, when you use an explicit solver in a model containing Simscape blocks, the system issues a warning to alert you to a potential problem. Use this configuration parameter to turn off this warning or to change it to an error message.

Settings

warning (default) | error | none

Specify whether or not the system issues a warning or error upon simulation when the model uses an explicit solver.

warning

Makes the system issue a warning upon simulation if the model uses an explicit solver.

The daessc variable-step Simulink^® solver provides algorithms specifically designed to simulate differential algebraic equations (DAEs) arising from modeling physical systems. However, it is possible to choose any variable-step or fixed-step solver for models containing Simscape blocks. Other implicit solvers, such as ode23t, ode15s, and ode14x, are a better choice for a typical model. To alert you to a potential issue, the system issues a warning when you use an explicit solver in a model containing Simscape blocks.

error

Makes the system issue an error upon simulation if the model uses an explicit solver.

If your model is stiff, and the use of explicit solvers undesirable, you may choose to select this option to avoid troubleshooting errors in the future.

none

Turns off issuing a warning or error upon simulation with explicit solver.

For models that are not stiff, explicit solvers can be effective, often taking fewer timesteps than implicit solvers. If you work with such models and use explicit solvers, select this option to turn off the warning upon simulation.

Recommended Settings

Application	Setting
Debugging	No Impact
Traceability	No Impact
Efficiency	No Impact
Safety precaution	No Impact

Programmatic Use

Parameter: ExplicitSolverDiagnosticOptions

Type: character vector | string scalar

Value: 'warning' | 'error' | 'none'

Default: 'warning'

Version History

Introduced in R2008b