Recommended Settings Summary for Model Configuration Parameters

The following table summarizes the impact of each configuration parameter on debugging, traceability, efficiency, and safety considerations, and indicates the factory default configuration settings for the GRT and ERT targets, unless otherwise specified.

For parameters that are available only when an ERT target is specified, see Recommended Settings Summary for Model Configuration Parameters (Embedded Coder).

For additional details, click the links in the Configuration Parameter column.

Mapping Application Requirements to the Solver Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Start time	No impact	No impact	No impact	0.0	0.0 seconds
Stop time	No impact	No impact	No impact	A positive value	10.0 seconds
Type	`Fixed-step`	`Fixed-step`	`Fixed-step`	`Fixed-step`	`Variable-step` (you must change to `Fixed-step` for code generation)
Solver	No impact	No impact	No impact	`Discrete (no continuous states)`	`ode3 (Bogacki-Shampine)`
Periodic sample time constraint	No impact	No impact	No impact	`Specified` or `Ensure sample time independent`	`Unconstrained`
Sample time properties	No impact	No impact	No impact	Period, offset, and priority of each sample time in the model; faster sample times must have higher priority than slower sample times	`''`
Treat each discrete rate as a separate task	No impact	No impact	No impact	No impact	On
Automatically handle rate transition for data transfer	No impact	No impact (for simulation and during development) Off (for production code generation)	No impact	Off	Off

Mapping Application Requirements to the Data Import/Export Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Input	No impact	No impact	No recommendation	No recommendation	Off
Initial state	No impact	No impact	No recommendation	No recommendation	Off
Time	No impact	No impact	No recommendation	No recommendation	On
States	No impact	No impact	No recommendation	No recommendation	Off
Output	No impact	No impact	No recommendation	No recommendation	On
Final states	No impact	No impact	No recommendation	No recommendation	Off
Signal logging	No impact	No impact	No recommendation	No recommendation	On
Record logged workspace data in Simulation Data Inspector	No impact	No impact	No recommendation	No recommendation	Off
Limit data points to last	No impact	No impact	No recommendation	No recommendation	On
Decimation	No impact	No impact	No recommendation	No recommendation	1
Format	No impact	No impact	No recommendation	No recommendation	`Array`
Output options	No impact	No impact	No recommendation	No recommendation	`Refine output`
Refine factor	No impact	No impact	No recommendation	No recommendation	1
Output times	No impact	No impact	No recommendation	No recommendation	`'[]'`

Mapping Application Requirements to the Math and Data Types Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Default for underspecified data type	No impact	No impact	`single`	No impact	`double`
Use division for fixed-point net slope computation	No impact	No impact	On (when target hardware supports efficient division) Off (otherwise)	No impact	`off`
Application lifespan (days)	No impact	No impact	Finite value	`inf`	`auto`
Use floating-point multiplication to handle net slope corrections	No impact	No impact	On (when target hardware supports efficient multiplication) Off (otherwise)	No recommendation	Off
*The command-line value is reverse of the listed value.

Mapping Application Requirements to the Optimization Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Default parameter behavior	`Tunable` (GRT) `Inlined` (ERT)	`Inlined`	`Inlined`	No impact	`Tunable` (GRT) `Inlined` (ERT)
Loop unrolling threshold	No impact	No impact	>0	No impact	5
Maximum stack size (bytes)	No impact	No impact	No impact	No impact	`Inherit from target`
Use memcpy for vector assignment	No impact	No impact	On	No impact	On
Memcpy threshold (bytes)	No impact	No impact	Accept default or determine target-specific optimal value	No impact	64
Inline invariant signals	Off	Off	On	No impact	Off
Remove code from floating-point to integer conversions that wraps out-of-range values	Off	Off	On (execution, ROM) No impact (RAM)	No impact	Off
Use bitsets for storing state configuration	Off	Off	Off (execution, ROM) On (RAM)	No impact	Off
Use bitsets for storing Boolean data	Off	Off	Off (execution, ROM) On (RAM)	No impact	Off

Mapping Application Requirements to the Diagnostics Pane: Solver Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Algebraic loop	`error`	No impact	No impact	`error`	`warning`
Minimize algebraic loop	No impact	No impact	No impact	`error`	`warning`
Block priority violation	No impact	No impact	No impact	`error`	`warning`
Consecutive zero-crossings violation	No impact	No impact	No impact	`warning` or `error`	`error`
Unspecified inheritability of sample time	No impact	No impact	No impact	`error`	`warning`
Solver data inconsistency	`warning`	No impact	`none`	No impact	`warning`
Automatic solver parameter selection	No impact	No impact	No impact	`error`	`warning`

Mapping Application Requirements to the Diagnostics Pane: Sample Time Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Source block specifies -1 sample time	No impact	No impact	No impact	`error`	`none`
Multitask rate transition	No impact	No impact	No impact	`error`	`error`
Single task rate transition	No impact	No impact	No impact	`none` or `error`	`none`
Multitask conditionally executed subsystem	No impact	No impact	No impact	`error`	`error`
Tasks with equal priority	No impact	No impact	No impact	`none` or `error`	`warning`
Enforce sample times specified by Signal Specification blocks	No impact	No impact	No impact	`error`	`warning`

Mapping Application Requirements to the Diagnostics Pane: Data Validity Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Signal resolution	`Explicit only` or `None`	`Explicit only` or `None`	`Explicit only` or `None`	`Explicit only`	`Explicit only`
Division by singular matrix	No impact	No impact	No impact	`error`	`none`
Underspecified data types	No impact	No impact	No impact	`error`	`none`
Simulation range checking	`warning` or `error`	`warning` or `error`	`none`	`error`	`none`
Wrap on overflow	No impact	No impact	No impact	`error`	`warning`
Saturate on overflow	No impact	No impact	No impact	`error`	`warning`
Inf or NaN block output	No impact	No impact	No impact	`error`	`none`
"rt" prefix for identifiers	No impact	No impact	No impact	`error`	`error`
Detect downcast	No impact	No impact	No impact	`error`	`error`
Detect overflow	No impact	No impact	No impact	`error`	`error`
Detect underflow	No impact	No impact	No impact	`error`	`none`
Detect precision loss	No impact	No impact	No impact	`error`	`warning`
Detect loss of tunability	No impact	No impact	No impact	`error`	`warning` for GRT-based targets `error` for ERT-based targets
Detect read before write	No impact	No impact	No impact	`error`	`Enable all as warnings`
Detect write after read	No impact	No impact	No impact	`error`	`Enable all as warning`
Detect write after write	No impact	No impact	No impact	`error`	`Enable all as errors`
Multitask data store	No impact	No impact	No impact	`error`	`warning`
Duplicate data store names	`warning`	No impact	`none`	No impact	`none`
Check undefined subsystem initial output	No impact	No impact	No impact	On	On

Mapping Application Requirements to the Diagnostics Pane: Type Conversion Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Unnecessary type conversions	No impact	No impact	No impact	`warning`	`none`
Vector/matrix block input conversion	No impact	No impact	No impact	`error`	`none`
32-bit integer to single precision float conversion	No impact	No impact	No impact	`warning`	`warning`

Mapping Application Requirements to the Diagnostics Pane: Connectivity Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Signal label mismatch	No impact	No impact	No impact	`error`	`none`
Unconnected block input ports	No impact	No impact	No impact	`error`	`none`
Unconnected block output ports	No impact	No impact	No impact	`error`	`none`
Unconnected line	No impact	No impact	No impact	`error`	`none`
Unspecified bus object at root Outport block	No impact	No impact	No impact	`error`	`warning`
Element name mismatch	No impact	No impact	No impact	`error`	`warning`
Bus signal treated as vector	No impact	No impact	No impact	`error`	`none`
Context-dependent inputs	No impact	No impact	No impact	`error`	`error`

Mapping Application Requirements to the Diagnostics Pane: Compatibility Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
S-function upgrades needed	No impact	No impact	No impact	`error`	`none`

Mapping Application Requirements to the Diagnostics Pane: Model Referencing Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Model block version mismatch	No impact	No impact	No impact	No recommendation	`none`
Port and parameter mismatch	No impact	No impact	No impact	`error`	`none`
Unsupported data logging	No impact	No impact	No impact	`error`	`warning`

Mapping Application Requirements to the Diagnostics Pane: Saving Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Block diagram contains disabled library links	No impact	No impact	No impact	No impact	`warning`
Block diagram contains parameterized library links	No impact	No impact	No impact	No impact	`none`

Mapping Application Requirements to the Diagnostics Pane: Stateflow Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Unused data, events, messages, and functions	`warning`	No impact	No impact (for simulation and during development) `none` (for production code generation)	`warning`	`warning`
Unexpected backtracking	`warning`	No impact	No impact	`error`	`warning`
Invalid input data access in chart initialization	`warning`	No impact	No impact	`error`	`warning`
No unconditional default transitions	`warning`	No impact	No impact (for simulation and during development) `none` (for production code generation)	`error`	`warning`
Transition outside natural parent	`warning`	No impact	No impact (for simulation and during development) `none` (for production code generation)	`error`	`warning`

Mapping Application Requirements to the Hardware Implementation Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Device vendor	No impact	No impact	No impact	Select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`None` if specified system target file is `ert.tlc`, `realtime.tlc`, or `autosar.tlc`. Otherwise, `Determine by Code Generation system target file`
Device vendor	No impact	No impact	No impact	Select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`Intel`
Device type	No impact	No impact	No impact	Select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`x86–64 (Windows64)`
Number of bits: char	No impact	No impact	Target specific	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`char` 8, `short` 16, `int` 32, `long` 32, `long long` 64, `float` 32, `double` 64, `native` 32, `pointer` 32
Largest atomic size: integer	No impact	No impact	Target specific	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	integer `Char`, floating-point `Float`
Byte ordering	No impact	No impact	No impact	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`Little Endian`
Signed integer division rounds to	No impact for simulation and during development `Undefined` for production code generation	No impact for simulation and during development `Zero` or `Floor` for production code generation	No impact for simulation and during development `Zero` for production code generation	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	`Zero`
Shift right on a signed integer as arithmetic shift	No impact	No impact	On	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	On
Support long long	No impact	No impact	On (execution, ROM)	No recommendation for simulation without code generation. For simulation with code generation, select your Device vendor and Device type if they are available in the drop-down list. If your Device vendor and Device type are not available, set device-specific values by using `Custom Processor`.	Off

Mapping Application Requirements to the Model Referencing Pane

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Rebuild	No impact	No impact	No impact	`If any changes detected` or `Never` If you use the `Never` setting, then set the Never rebuild diagnostic parameter to `Error if rebuild required`	`If any changes detected`
Never rebuild diagnostic	No impact	No impact	No impact	`error if rebuild required`	`error if rebuild required`
Enable parallel model reference builds	No impact	No impact	No impact	No impact	Off
MATLAB worker initialization for builds	No impact	No impact	No impact	No impact	`None`
Total number of instances allowed per top model	No impact	No impact	No impact	No recommendation	`Multiple`
Pass fixed-size scalar root inputs by value for code generation	No impact	No impact	No impact	No recommendation	Off
Minimize algebraic loop occurrences	No impact	No impact	No impact	No recommendation	Off
Propagate sizes of variable-size signals	No impact	No impact	No impact	No recommendation	`Infer from blocks in model`
Model dependencies	No impact	No impact	No impact	No recommendation	`''`

Mapping Application Requirements to the Simulation Target Pane: General Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Enable memory integrity checks	On	No impact	No recommendation	On	On
Echo expressions without semicolons	On	No impact	Off	No impact	On
Break on Ctrl+C	On	No recommendation	No recommendation	No recommendation	On

Mapping Application Requirements to the Simulation Target Pane: Symbols Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Reserved names	No impact	No impact	No impact	No recommendation	`{}`

Mapping Application Requirements to the Simulation Target Pane: Custom Code Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Parse custom code symbols	On	No impact	No impact	On	On
Source file	No recommendation	No recommendation	No recommendation	No recommendation	`''`
Header file	No recommendation	No recommendation	No recommendation	No recommendation	`''`
Initialize function	No recommendation	No recommendation	No recommendation	No recommendation	`''`
Terminate function	No recommendation	No recommendation	No recommendation	No recommendation	`''`
Include directories	No impact	No impact	No impact	No recommendation	`''`
Source files	No impact	No impact	No impact	No recommendation	`''`
Libraries	No impact	No impact	No impact	No recommendation	`''`
Defines	No impact	No impact	No impact	No recommendation	`''`

Mapping Application Requirements to the Code Generation Pane: General Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
System target file	No impact	No impact	No impact	No impact (GRT) ERT based (ERT)	`grt.tlc`
Language	No impact	No impact	No impact	No impact	C
Language standard	No impact	No impact	Valid library	No impact	`C99 (ISO)`
Compiler optimization level	`Optimizations off (faster builds)`	`Optimizations off (faster builds)`	`Optimizations on (faster runs)` (execution) No impact (ROM, RAM)	No impact	`Optimizations off (faster builds)`
Custom compiler optimization flags	`Optimizations off (faster builds)`	`Optimizations off (faster builds)`	`Optimizations on (faster runs)`	No impact	`Optimizations off (faster builds)`
Generate makefile	No impact	No impact	No impact	No impact	On
Make command	No impact	No impact	No impact	No recommendation	`make_rtw`
Template makefile	No impact	No impact	No impact	No impact	`grt_default_tmf`
Select objective	`Debugging`	Not applicable for GRT-based targets	`Execution efficiency`	No recommendation	`Unspecified`
Check model before generating code	`On (proceed with warnings)` or `On (stop for warnings)`	`On (proceed with warnings)` or `On (stop for warnings)`	`On (proceed with warnings)` or `On (stop for warnings)`	`On (proceed with warnings)` or `On (stop for warnings)`	`Off`
Generate code only	Off	No impact	No impact	No impact	Off
Verbose build	On	No impact	No impact	No recommendation	On
Retain .rtw file	On	No impact	No impact	No impact	Off
Profile TLC	On	No impact	No impact	No impact	Off
Start TLC debugger when generating code	On	No impact	No impact	No impact	Off
Start TLC coverage when generating code	On	No impact	No impact	No impact	Off
Enable TLC assertion	On	No impact	No impact	No recommendation	Off

Mapping Application Requirements to the Code Generation Pane: Report Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Create code generation report	On	On	No impact	No recommendation	Off
Open report automatically	On	On	No impact	No impact	Off

Mapping Application Requirements to the Code Generation Pane: Comments Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Include comments	On	On	No impact	No recommendation	On
Simulink block comments	On	On	No impact	No recommendation	On
Stateflow object comments	On	On	No impact	No recommendation	Off
Show eliminated blocks	On	On	No impact	No recommendation	On
Verbose comments for 'Model default' storage class	On	On	No impact	No recommendation	On
Operator annotations (Embedded Coder)	No impact	On	No impact	No recommendation	On

Mapping Application Requirements to the Code Generation Pane: Identifiers Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Maximum identifier length	Valid value	>30	No impact	>30	31
Use the same reserved names as Simulation Target	No impact	No impact	No impact	No impact	Off
Reserved names	No impact	No impact	No impact	No impact	`{}`

Mapping Application Requirements to the Code Generation Pane: Custom Code Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Use the same custom code settings as Simulation Target	No impact	No impact	No impact	No impact	Off
Additional code	No impact	No impact	No impact	No impact	`''`
Include headers	No impact	No impact	No impact	No impact	`''`
Initialize code	No impact	No impact	No impact	No impact	`''`
Terminate code	No impact	No impact	No impact	No impact	`''`
Include directories	No impact	No impact	No impact	No impact	`''`
Source files	No impact	No impact	No impact	No impact	`''`
Libraries	No impact	No impact	No impact	No impact	`''`
Defines	No impact	No impact	No impact	No impact	`''`

Mapping Application Requirements to the Code Generation Pane: Interface Tab

Configuration Parameter	Settings for Building Code				Factory Default
Configuration Parameter	Debugging	Traceability	Efficiency	Safety precaution	Factory Default
Code replacement library	No impact	No impact	Valid library	No impact	`None`
Shared code placement	`Shared location` (GRT) No impact (ERT)	`Shared location` (GRT) No impact (ERT)	No impact (execution, RAM) `Shared location` (ROM)	No impact	`Auto`
Support: non-finite numbers	No impact	No impact	Off (Execution, ROM) No impact (RAM)	No recommendation	On
Code interface packaging	No impact	No impact	`Reusable function` or `C++ class`	No impact	`Nonreusable function` if Language is set to `C`; `C++ class` if Language is set to `C++`
Multi-instance code error diagnostic	`Warning` or `Error`	No impact	`None`	No impact	`Error`
Single output/update function	On	On	On	No recommendation	On
MAT-file logging	On	No impact	Off	Off	On (GRT) Off (ERT)
Suppress generation of fixed-point word size checks	No impact	No impact	No impact	Off On if you check code generator assumptions. See Check Code Generation Assumptions (Embedded Coder) and Verification of Code Generation Assumptions (Embedded Coder).	Off
MAT-file variable name modifier (Embedded Coder)	No impact	No impact	No impact	No impact	`rt_`
Generate C API for: signals	No impact	No impact	No impact	No impact (development) Off (production)	Off
Generate C API for: parameters	No impact	No impact	No impact	No impact (development) Off (production)	Off
Generate C API for: states	No impact	No impact	No impact	No impact (development) Off (production)	Off
Generate C API for: root-level I/O	No impact	No impact	No impact	No impact (development) Off (production)	Off
ASAP2 interface	No impact	No impact	No impact	No impact (development) Off (production)	Off
External mode	No impact	No impact	No impact	No impact (development) Off (production)	Off
Transport layer	No impact	No impact	No impact	No impact	`tcpip`
MEX-file arguments	No impact	No impact	No impact	No impact	`''`
Static memory allocation	No impact	No impact	No impact	No impact	Off
Static memory allocation	No impact	No impact	No impact	No impact	1000000