Command-Line Interface for the Fixed-Point Tool

Use the DataTypeWorkflow.Converter class and its associated methods to perform the same fixed-point conversion tasks as the iterative fixed-point conversion workflow in the Fixed-Point Tool. Use the fxpopt function and its associated objects and methods to perform the same fixed-point conversion tasks as the optimized fixed-point conversion workflow in the Fixed-Point Tool. The range collection workflow of the Fixed-Point Tool does not have an equivalent command-line interface. To access the full set of statistics and visualizations that this workflow provides, use the app interface.

Note

Do not use the Fixed-Point Tool and the command-line interface in the same conversion session.

These tables compare the functionality of the command-line interfaces and the app at each step of the workflow to help you decide which to use.

Iterative Fixed-Point Conversion Workflow

Workflow Step	Fixed-Point Tool	Command-Line Interface
Set up system under design.	Setup pane	DataTypeWorkflow.Converter
Collect ranges using simulation ranges, derived range analysis, or both.	Range Collection Mode section of Setup pane Collect Ranges button	deriveMinMax simulateSystem
Run multiple simulations using simulation inputs.	Simulation Inputs section of Setup pane	Simulink.SimulationInput simulateSystem
Specify signal tolerances.	Signal Tolerances section of Setup pane	DataTypeWorkflow.ProposalSettings addTolerance clearTolerances showTolerances
Check for and replace unsupported functions in MATLAB Function blocks.	In R2026a: Function Replacement section of Setup pane	In R2025a: getUnsupportedFunctionsForSystem DataTypeWorkflow.FunctionReplacement entries insert lookup remove
Prepare system for conversion.	Prepare button	Not supported Use DataTypeWorkflow.findDecoupledSubsystems to list blocks isolated by the Fixed-Point Tool during the prepare step.
Configure data type override settings for range collection.	Collect Ranges button arrow	applySettingsFromShortcut applySettingsFromRun
Edit data type proposal settings.	Settings button arrow	DataTypeWorkflow.ProposalSettings
Propose data types.	Propose Data Types button	proposeDataTypes
Edit and selectively apply proposed data types.	Results spreadsheet	Not supported
Apply proposed data types and function replacements.	Apply Data Types button	applyDataTypes
Verify new fixed-point settings and analyze results.	Simulate with Embedded Types button Run to compare in SDI dropdown Compare Results button	DataTypeWorkflow.Result DataTypeWorkflow.VerificationResult proposalIssues results saturationOverflows wrapOverflows verify explore
Restore original model.	Restore Original Model button	Not supported

Optimized Fixed-Point Conversion Workflow

Workflow Step	Fixed-Point Tool	Command-Line Interface
Set up system under design.	Setup pane	fxpopt fxpOptimizationOptions
Include derived ranges in range analysis.	Range Collection Mode section of Setup pane	UseDerivedRangeAnalysis property of AdvancedOptions
Run multiple simulations using simulation inputs.	Simulation Inputs section of Setup pane	Simulink.SimulationInput SimulationScenarios property of AdvancedOptions
Specify signal tolerances.	Signal Tolerances section of Setup pane	fxpOptimizationOptions addTolerance showTolerances
Specify known parameter data types.	Not supported	addSpecification showSpecifications
Prepare system for conversion.	Prepare button	Not supported Use the HandleUnsupported property of AdvancedOptions to specify how the optimizer handles unsupported blocks.
Configure data type override settings for range collection phase of optimization.	Not supported	DataTypeOverride property of AdvancedOptions
Configure optimization options.	Optimization Options button arrow	fxpOptimizationOptions
Optimize data types.	Optimize Data Types button	fxpopt
Explore optimization solutions and apply result.	Result pane Apply and Compare button	explore
Verify new fixed-point settings and analyze results.	Compare button	OptimizationSolution showContents OptimizationResult explore openSimulationManager
Export optimization script.	Export Script button	Not applicable
Restore original model.	Restore Original Model button	revert