Simplified Initialization Mode - MATLAB & Simulink (original) (raw)
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Initialization mode controls how Simulink® handles:
- Initialization values for conditionally executed subsystems.
- Initial values for Merge blocks.
- Discrete-Time Integrator blocks.
- Subsystem elapsed time.
The default initialization mode for a model is simplified. This mode uses enhanced processing to improve consistency of simulation results and helps to:
- Attain the same simulation results with the same inputs when using the same blocks in a different model.
- Avoid unexpected changes to simulation results as you modify a model.
When to Use Simplified Initialization
Use simplified initialization mode for models that contain one or more of the following blocks:
- Conditional subsystem blocks.
- Merge blocks. If a root Merge block has an empty matrix (
[]) for its initial output value, simplified mode uses the default ground value of the output data type. - Discrete-Time Integrator blocks. Simplified mode always uses the initial value as both the initial and reset value for output from a Discrete-Time Integrator block.
Use simplified mode if your model uses features that require simplified initialization mode, such as:
- Specify a structure to initialize a bus.
- Branch merged signals inside a conditional subsystem.
Set Initialization Mode to Simplified
Simplified mode is the default initialization mode when creating a new Simulink model. If your model is using classic mode, you might need to make changes after you select simplified mode. See Convert from Classic to Simplified Initialization Mode.
- Open the Configuration Parameters dialog box. On the Modeling tab and from the Setup section, select Model Settings
. - In the search box, enter Underspecified initialization detection.
- From the drop-down list, select
Simplified.
For examples configured to use simplified mode, see Identity Transformation Can Change Model Behavior, Inconsistent Output with Discrete-Time Integrator or S-Function Block and Execution Order Affecting Merge Block Output.