Underspecified initialization detection

How software determines initial conditions for subset of Simulink blocks that have underspecified initial conditions

Model Configuration Pane: Diagnostics / Data Validity

Description

The Unspecified initialization detection parameter specifies how the software determines the initial conditions for blocks that have underspecified initial conditions. The software determines the initial condition for conditionally executed subsystems, Merge blocks, subsystem elapsed time, and Discrete-Time Integrator blocks when the model does not fully specify the initial conditions.

Settings

Simplified (default) | Classic

Simplified

The software determines initial conditions using an enhanced algorithm that can improve the consistency of simulation results, especially in models that:

• Do not specify initial conditions for output ports of conditional subsystems

• Contain conditionally executed subsystems that provide inputs for S-functions

  For more information, see Simplified Initialization Mode.

  To update your model to use the simplified initialization mode, run these Model Advisor checks:

  • Check usage of Merge blocks

  • Check usage of Outport blocks

  • Check usage of Discrete-Time Integrator blocks

  • Check model settings for migration to simplified initialization mode

  For more information, see Convert from Classic to Simplified Initialization Mode.

Classic

The software determines initial conditions the same way it does for versions prior to R2008b.

For more information, see Classic Initialization Mode.

Recommended Settings

Application	Setting
Debugging	Simplified
Traceability	Simplified
Efficiency	Simplified
Safety precaution	Simplified

Programmatic Use

Parameter: UnderspecifiedInitializationDetection

Type: string | character vector

Values: 'Classic' | 'Simplified'

Default: 'Simplified'

Version History

Introduced in R2008b