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Version 7.3 (R2009a) Stateflow and Stateflow Coder Software

This table summarizes what's new in V7.3 (R2009a):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes—Details labeled as Compatibility Considerations, below. See also Summary.	Bug Reports Includes fixes	No

New features and changes introduced in this version are:

• Support for Saving the Complete Simulation State at a Specific Time

• Enhanced Support for Enumerated Data Types

• New Boolean Keywords in Stateflow Action Language

• Enhanced Control of Inlining State Functions in Generated Code

• New Diagnostic to Detect Unintended Backtracking Behavior in Flow Graphs

• Use of Basic Linear Algebra Subprograms (BLAS) Libraries for Speed

• Enhanced Support for Replacing C Math Functions with Target-Specific Implementations

• Smart Transitions Now Prefer Straight Lines

• Clicking Up-Arrow Button in the Stateflow Editor Closes Top-Level Chart

• Enhanced Type Resolution for Symbols

• Enhanced Code Generation for Stateflow Events

• Enhanced Real-Time Workshop Generated Code for Charts with Simulink Functions

• Use of en, du, ex, entry, during, and exit for Data and Event Names Being Disallowed in a Future Version

• Support for Machine-Parented Events Being Removed in a Future Version

Support for Saving the Complete Simulation State at a Specific Time

You can save the complete simulation state at a specific time and then load that state for further simulation. This enhancement provides these benefits:

• Enables running isolated segments of a simulation without starting from time t = 0, which saves time

• Enables testing of the same chart configuration with different settings

• Enables testing of hard-to-reach chart configurations by loading a specific simulation state

For more information, see Saving and Restoring Simulations Using SimState in the Stateflow and Stateflow Coder User's Guide.

Enhanced Support for Enumerated Data Types

In R2009a, you can use enumerated data in Embedded MATLAB functions, truth table functions that use Embedded MATLAB action language, and Truth Table blocks. See Using Enumerated Data in Stateflow Charts in the Stateflow and Stateflow Coder User's Guide.

New Boolean Keywords in Stateflow Action Language

You can now use true and false as Boolean keywords in Stateflow action language. For more information, see Symbols in Action Language in the Stateflow and Stateflow Coder User's Guide.

Enhanced Control of Inlining State Functions in Generated Code

In R2009a, a new Function Inline Option parameter is available in the State properties dialog box. This parameter enables better control of inlining state functions in generated code, which provides these benefits:

• Prevents small changes to a model from causing major changes to the structure of generated code

• Enables easier manual inspection of generated code, because of a one-to-one mapping between the code and the model

For more information, see Controlling Inlining of State Functions in Generated Code in the Stateflow and Stateflow Coder User's Guide.

New Diagnostic to Detect Unintended Backtracking Behavior in Flow Graphs

A new diagnostic detects unintended backtracking behavior in flow graphs during simulation. A warning message appears, with suggestions on how to fix the flow graph to prevent unintended backtracking. For more information, see Best Practices for Creating Flow Graphs in the Stateflow and Stateflow Coder User's Guide.

Use of Basic Linear Algebra Subprograms (BLAS) Libraries for Speed

Embedded MATLAB functions in Stateflow charts can now use BLAS libraries to speed up low-level matrix operations during simulation. For more information, see Simulation Target Pane: General in the Simulink documentation.

Enhanced Support for Replacing C Math Functions with Target-Specific Implementations

You can now replace the pow function with a target-specific implementation. For more information about Target Function Libraries, see:

• Example: Mapping Math Functions to Target-Specific Implementations

• Replacement of C Math Library Functions with Target-Specific Implementations

• Replacing Operators with Target Functions

Smart Transitions Now Prefer Straight Lines

In R2009a, the graphical behavior of smart transitions has been enhanced as follows:

• Smart transitions maintain straight lines between states and junctions whenever possible. Previously, smart transitions would preserve curved lines.

• When you drag a smart transition radially around a junction, the end on the junction follows the tip to maintain a straight line by default. Previously, the end on the junction would maintain its original location and not follow the tip of the transition.

For more information, see What Smart Transitions Do in the Stateflow and Stateflow Coder User's Guide.

Clicking Up-Arrow Button in the Stateflow Editor Closes Top-Level Chart

When a top-level chart appears in the Stateflow Editor, clicking the up-arrow button in the toolbar causes the chart to close and the Simulink model that contains the chart to appear. This behavior is consistent with clicking the up-arrow button in the toolbar of a Simulink subsystem window.

Previously, clicking the up-arrow button for a top-level chart would cause the Simulink model to appear, but the chart would not close. For more information, see Navigating Subcharts in the Stateflow and Stateflow Coder User's Guide.

Enhanced Type Resolution for Symbols

In R2009a, type resolution for Stateflow data has been enhanced to support any MATLAB expression that evaluates to a type.

Enhanced Code Generation for Stateflow Events

In R2009a, the generated code for managing Stateflow events uses a deterministic numbering method. This enhancement minimizes unnecessary differences in the generated code for Stateflow charts between R2009a and any future release.

Enhanced Real-Time Workshop Generated Code for Charts with Simulink Functions

In R2009a, Real-Time Workshop^® generated code for charts with Simulink functions no longer uses unneeded global variables for the function inputs and outputs. The interface can be represented by local temporary variables or completely eliminated by optimizations, such as expression folding. This enhancement provides reduced RAM consumption and faster execution time.

Use of en, du, ex, entry, during, and exit for Data and Event Names Being Disallowed in a Future Version

In a future version of Stateflow software, use of en, du, ex, entry, during, or exit for naming data or events will be disallowed. In R2009a, a warning message appears when you run a model that contains any of these keywords as the names of data or events.

Compatibility Considerations

To avoid warning messages, rename any data or event that uses en, du, ex, entry, during, or exit as an identifier.

Support for Machine-Parented Events Being Removed in a Future Version

In a future version of Stateflow software, support for machine-parented events will be removed. In R2009a, a warning message appears when you simulate models that contain events at the machine level.

Compatibility Considerations

To prevent undesired behavior for simulation and code generation, do not use machine-parented events. For simulation, broadcasting an event to all charts in your model causes the following to occur:

• Charts wake up without regard to data dependencies.

• Charts that are disabled might wake up.

• Charts that use function-call or edge-triggered events wake up.

• Charts unrelated to the event wake up.

• Infinite recursive cycles can occur because the chart that broadcasts the event wakes up.

For code generation, machine-parented events prevent code reuse for the entire model.

Version 7.4 (R2009b) Stateflow and Stateflow Coder Software

Version 7.2 (R2008b) Stateflow and Stateflow Coder Software

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