• Improved Accuracy of Variable-Step Discrete Solver

• New Compilation Report for Embedded MATLAB Function Blocks

• Integer Arithmetic Applied to Sample Hit Computations

• Simulation Restart in R2009b

• Data Class Infrastructure Partially Deprecated

• Discrete Transfer Fcn Block Has Performance, Data Type, Dimension, and Complexity Enhancements

• Direct Lookup Table (n-D) Block Enhancements

• Lookup Table (n-D) and Interpolation Using Prelookup Blocks Perform Efficient Fixed-Point Interpolations

• New Rounding Modes Added to Multiple Blocks

• Discrete Filter Block Performance, Data Type, Dimension, and Complexity Enhancements

• Dot Product Block Converted from S-Function to Core Block

• Removal of Lookup Table Designer from the Lookup Table Editor

• Signal Can Resolve to at Most One Signal Object

• Conditionally Executed Subsystem Initial Conditions

• Data Type Override Now Works Consistently on Outputs

• Improperly-Scaled Fixed-Point Relational Operators Now Match MATLAB Results

• One Parameter Controls Accelerator Mode Build Verbosity

• Signal Logging and Test Points Are Controlled Independently

• Signal Logging Consistently Retains Duplicate Signal Regions

• Modifying a Link to a Library Block in a Callback Function Can Cause Illegal Modification Errors

• Mapping of Target Object Properties to Parameters in the Configuration Parameters Dialog Box

• Legacy Code Tool Enhancement

See the Compatibility Considerations subheading for each of these new features or changes:

• Specify Scaling Explicitly for Fixed-Point Data

• Array Format Cannot Be Used to Export Multiple Matrix Signals

• Changing Nontunable Values Does Not Affect the Current Simulation

• Detection of Illegal Rate Transitions

• Explicit Scaling Required for Fixed-Point Data

• Rate Transition Blocks Needed on Virtual Buses

• Sample Times for Virtual Blocks

• New Discrete FIR Filter Block Replaces Weighted Moving Average Block

• Solver Controls

• S-Functions

See the Compatibility Considerations subheading for each of these new features or changes:

• Simulink Accelerator

• Mask Editor Now Requires Java

• Support for Algorithms That Span Multiple M-Files

• New Break Link Options for save_system Command

• Simulink Software Checks Data Type of the Initial Condition Signal of the Integrator Block

See the Compatibility Considerations subheading for each of these new features or changes:

• GNU Compiler Upgrade

• Change to Simulink.ModelAdvisor.getModelAdvisor Method

• Legacy Code Tool Enhancements

• Using & and | Operators in Embedded MATLAB Function Blocks

• Calling get Function from Embedded MATLAB Function Blocks

• Default for Signal Resolution Parameter Has Changed

• Port Parameter Evaluation Has Changed

• Referencing Configuration Sets

• Change to PaperPositionMode Parameter

• Change in Version 6.5 (R2006b) Introduced Incompatibility

See the Compatibility Considerations subheading for each of these new features or changes:

• Enhanced Lookup Table Blocks

• Parameter Objects Can Now Be Used to Specify Model Configuration Parameters

• New Requirement for Calling MATLAB Functions from Embedded MATLAB Function Blocks

• Type and Size Mismatch of Values Returned from MATLAB Functions Generates Error

• Changes to Integrator Block's Level Reset Options

• Attempting to Reference a Symbol in an Uninitialized Mask Workspace Generates an Error

• Embedded MATLAB Function Blocks Cannot Output Character Data

See the Compatibility Considerations subheading for each of these new features or changes:

• Range-Checking for Parameter and Signal Object Values

• Concatenate Block

• Built-in Block's Initial Appearance Reflects Parameter Settings

• Setting FIMATH Cast Before Sum to False No Longer Supported in Embedded MATLAB MATLAB Function Blocks

• Type Mismatch of Scalar Output Data in Embedded MATLAB Function Blocks Generates Error

• Implicit Parameter Type Conversions No Longer Supported in Embedded MATLAB Function Blocks

See the Compatibility Considerations and/or Limitations subheading for each of these changes:

• Model Referencing

• MEX-Files on Windows Systems

• Fixed-Point Functions No Longer Supported for Use in Signal Objects

• Parameter Object Expressions No Longer Supported in Dialog Boxes

• MEX-File Extension Changed

See the Compatibility Considerations and/or Limitations subheadings for each of these changes:

• Rootlevel Input Ports

See the Compatibility Considerations for this change:

• Model Load Warnings

See the Compatibility Considerations and Limitations subheadings for each of these changes:

• Model Referencing

• MATLAB Data Type Conversions

• Signal Object Resolution Changes

• Loading Models Containing Non-ASCII Characters

• Change in Sample Time Behavior of Unary Minus Block

• Initial Output of Conditionally Executed Subsystems

• Execution Context Default Changes

• Internal Signal Structures Revamped

See the Compatibility Considerations subheading for this change:

• Tunable Parameters for Unified Fixed-Point Blocks

See the Compatibility Considerations subheadings for each of these changes:

• Enhanced Diagnostic Viewer

• Enhanced Mask Editor

• Model Discretizer

See the Compatibility Considerations subheadings for each of these changes:

• Simulink Block Library Reorganization

• S-Functions Sorted Like Built-In Blocks

• Added Latched Triggered Subsystems

• Self-Triggering Subsystems Are No Longer Allowed

• Running Simulink 4.1 Models in Simulink 4.0 Software

• Direct Feedthrough Compensation Deprecated

• Improved Invalid Model Configuration Diagnostics

See the Compatibility Considerations for this change:

• Port Name Property