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Automated Fixed-Point Conversion in MATLAB

Conversion to fixed point using the Fixed-Point Converter app

The Fixed-Point Converter app enables you to convert floating-point MATLAB® code to fixed-point MATLAB code.

Use fiaccel to convert floating-point MATLAB code to fixed-point MATLAB code at the command line.

Apps

Fixed-Point ConverterConvert MATLAB code to fixed point

Functions

fiaccelAccelerate fixed-point code and convert floating-point MATLAB code to fixed-point MATLAB code
coder.configCreate configuration object for fixed-point or single-precision conversion
coder.mexconfigCode acceleration configuration object
coder.approximationCreate function replacement configuration object
coder.allowpcodeControl code generation from protected MATLAB files
coder.constFold expressions into constants in generated code
coder.extrinsicDeclare a function as extrinsic and execute it in MATLAB
coder.inlineControl inlining of a specific function in generated code
coder.loadLoad compile-time constants from MAT-file or ASCII file into caller workspace
coder.newtypeCreate coder.Type object to represent type of an entry-point function input
coder.nullcopyDeclare uninitialized variables in code generation
coder.resizeResize coder.Type object
coder.targetDetermine if code generation target is specified target
coder.typeofCreate coder.Type object to represent the type of an entry-point function input
coder.unrollUnroll for-loop by making a copy of the loop body for each loop iteration
coder.varsizeDeclare variable-size data

Classes

coder.mexconfigCode acceleration configuration object for use with fiaccel
coder.FixPtConfigFloating-point to fixed-point conversion configuration object
coder.ArrayTypeRepresent set of MATLAB arrays
coder.ConstantSpecification of constant value for code generation
coder.EnumTypeRepresent set of MATLAB enumerations
coder.FiTypeRepresent set of MATLAB fixed-point arrays
coder.PrimitiveTypeRepresent set of logical, numeric, or char arrays
coder.StructTypeRepresent set of MATLAB structure arrays
coder.TypeRepresent set of MATLAB values

Topics

Automated Fixed-Point Conversion Workflow

Decide Which Workflow is Right for Your Application

Learn the benefits of each conversion workflow to help you decide which one best fits your needs.

Fixed-Point Conversion Workflows

Learn which fixed-point conversion method best matches your end goal and your level of fixed-point expertise.

Automated Fixed-Point Conversion

Using the Fixed-Point Converter app for automated fixed-point conversion.

Automated Fixed-Point Conversion Best Practices

Generate fixed-point code according to best practices.

Propose Data Types Based on Simulation Ranges

Propose fixed-point data types based on simulation ranges using the Fixed-Point Converter app.

Propose Data Types Based on Derived Ranges

Propose fixed-point data types based on static ranges using the Fixed-Point Converter app.

Convert Fixed-Point Conversion Project to MATLAB Scripts

Use project settings for fixed-point conversion at the command line.

Propose Fixed-Point Types

Specify Type Proposal Options

Specify options when proposing types for automated fixed-point conversion.

View and Modify Variable Information

View and modify variable information for fixed-point conversion.

Detect Unexecuted and Constant-Folded Code

Learn how the app detects code that is not executed or code that is constant folded during simulation of your test file.

Convert to Fixed Point

Generated Fixed-Point Code

Avoid issues with generated fixed-point code.

Replacing Functions Using Lookup Table Approximations

Generate lookup table approximations to replace custom functions or functions that are not supported for fixed point.

Replace the exp Function with a Lookup Table

Replace a function with a lookup table approximation in fixed-point code generated with the Fixed-Point Converter app.

Replace a Custom Function with a Lookup Table

Replace a custom function with a lookup table approximation function by using the Fixed-Point Converter app.

Verify Fixed-Point Conversion

Visualize Differences Between Floating-Point and Fixed-Point Results

Use a custom plot function to compare the behavior of the generated fixed-point code against the behavior of the original floating-point MATLAB code.

Enable Plotting Using the Simulation Data Inspector

Inspect and compare floating-point and fixed-point logged input and output data.

Custom Plot Functions

Visualize numerical differences during fixed-point conversion.

Detect Overflows

Detect overflows using the app.

Supported Language Features

MATLAB Language Features Supported for Automated Fixed-Point Conversion

Learn which language features are and are not supported for automated fixed-point conversion.

Convert Code Containing Global Variables to Fixed-Point

Convert MATLAB code using global variables to fixed-point using the app.

Convert Code Containing Structures to Fixed Point

Convert a MATLAB algorithm containing structures to fixed point using the Fixed-Point Converter app.

Generate Fixed-Point MATLAB Code for Multiple Entry-Point Functions

Generate fixed-point code for multiple entry-point functions using the Fixed-Point Converter app.

Fixed-Point Code for MATLAB Classes

Use supported constructs and coding style best practices for fixed-point conversion of MATLAB classes.

Convert Code Containing Global Data to Fixed Point

Convert MATLAB code using global variables to fixed-point programmatically.

Convert dsp.FIRFilter Object to Fixed-Point Using the Fixed-Point Converter App

Convert a dsp.FIRFilter System object™, which filters a high-frequency sinusoid signal, to fixed-point using the Fixed-Point Converter app.

System Objects Supported by Fixed-Point Converter App

Use the Fixed-Point Converter app to automatically propose and apply data types for commonly used system objects.

Command Line Workflow

Propose Data Types Based on Simulation Ranges

Propose fixed-point data types based on simulation ranges using the fiaccel function.

Propose Data Types Based on Derived Ranges

Propose fixed-point data types based on static ranges using the fiaccel function.

Detect Overflows

Detect overflows at the command line.

Replace the exp Function with a Lookup Table

Replace a function with a lookup table approximation in fixed-point code generated with the fiaccel function.

Replace a Custom Function with a Lookup Table

Replace a custom function with a lookup table approximation function by using the fiaccel function.

Enable Plotting Using the Simulation Data Inspector

Inspect and compare floating-point and fixed-point logged input and output data.

Visualize Differences Between Floating-Point and Fixed-Point Results

Use a custom plot function to compare the behavior of the generated fixed-point code against the behavior of the original floating-point MATLAB code.

Troubleshooting

Generated Fixed-Point Code

Avoid issues with generated fixed-point code.

Data Type Issues in Generated Code

Highlight potential data type issues in report.

Debug Numerical Issues in Fixed-Point Conversion Using Variable Logging

Learn how to debug your fixed-point code when you need more than out of the box conversion.

Why Does the Fixed-Point Converter App Not Propose Data Types for System Objects?

Troubleshoot missing data type proposals for System objects.

Slow Operations in the Fixed-Point Converter App

Determine whether code generation readiness screening is causing slow operations in the app.