Fixed-Point Conversion

Convert floating-point code to fixed point, optimize fixed-point data types (requires Fixed-Point Designer™)

If you have the Fixed-Point Designer product, to meet target hardware constraints, generate fixed-point C/C++ code.

Classes

coder.FixPtConfig Floating-point to fixed-point conversion configuration object

Functions

`coder`	Open MATLAB Coder app
`codegen`	Generate C/C++ code from MATLAB code
`coder.config`	Create code generation configuration objects
`coder.approximation`	Create function replacement configuration object
`coder.float2fixed.skip`	Exclude functions from fixed-point conversion (Since R2024b)

Topics

Automated Conversion — Programmatic Workflow

Automated Fixed-Point Conversion
Using the Fixed-Point Converter app for automated fixed-point conversion.
Convert MATLAB Code to Fixed-Point C Code
Generate fixed-point C code with codegen.
Automated Fixed-Point Conversion Best Practices
Generate fixed-point code according to best practices.
Propose Fixed-Point Data Types Based on Simulation Ranges
Propose fixed-point data types based on simulation ranges using the codegen function.
Propose Fixed-Point Data Types Based on Derived Ranges
Propose fixed-point data types based on static ranges using the codegen function.
Detect Overflows
Detect overflows at the command line.
MATLAB Language Features Supported for Automated Fixed-Point Conversion
For automated fixed-point conversion, use supported MATLAB^® language features.
Fixed-Point Code for MATLAB Classes
Use supported constructs and coding style best practices for fixed-point conversion of MATLAB classes.
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.

Automated Conversion — App Workflow

Convert MATLAB Code to Fixed-Point C Code
Generate fixed-point C code from floating-point MATLAB code.
Propose Fixed-Point Data Types Based on Simulation Ranges
Propose fixed-point data types based on simulation ranges using the MATLAB Coder™ app.
Propose Fixed-Point Data Types Based on Derived Ranges
Propose fixed-point data types based on static ranges using the MATLAB Coder app.
View and Modify Variable Information
View and modify variable information for fixed-point conversion.
Specify Type Proposal Options
Specify options used when proposing types for automated fixed-point conversion.
Detect Overflows
Detect overflows using the app.
Generated Fixed-Point Code
Avoid issues with generated fixed-point code.
Data Type Issues in Generated Code
Highlight potential data type issues in report.
Fixed-Point Code for MATLAB Classes
Use supported constructs and coding style best practices for fixed-point conversion of MATLAB classes.
Custom Plot Functions
Visualize numerical differences during fixed-point conversion.
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 MATLAB Coder app.
Replace a Custom Function with a Lookup Table
Replace a custom function with a lookup table approximation function by using the MATLAB Coder app.
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.
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 Fixed-Point Conversion Project to MATLAB Scripts
Use project settings for fixed-point conversion at the command line.