Fixed-Point Converter

(Not recommended) Convert MATLAB code to fixed point

The Fixed-Point Converter app is not recommended. Convert fixed-point conversion projects to MATLAB^® scripts instead. For more information, see Version History.

Description

The Fixed-Point Converter app converts floating-point MATLAB code to fixed-point MATLAB code.

Using the app, you can:

• Propose data types based on simulation range data, static range data, or both.

• Propose fraction lengths based on default word lengths or propose word lengths based on default fraction lengths.

• Optimize whole numbers.

• Specify safety margins for simulation min/max data.

• View a histogram of bits used by each variable.

• Specify replacement functions or generate approximate functions for functions in the original MATLAB algorithm that do not support fixed point.

• Test the numerical behavior of the fixed-point code. You can then compare its behavior against the floating-point version of your algorithm using either the Simulation Data Inspector or your own custom plotting functions.

If your end goal is to generate fixed-point C code, use the MATLAB Coder™ app instead. See Convert MATLAB Code to Fixed-Point C Code (MATLAB Coder).

If your end goal is to generate HDL code, use the HDL Coder™ workflow advisor instead. See Floating-Point to Fixed-Point Conversion (HDL Coder).

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Open the Fixed-Point Converter App

• MATLAB Toolstrip: On the Apps tab, under Code Generation, click the app icon.

• MATLAB command prompt: Enter fixedPointConverter.

• To open an existing Fixed-Point Converter app project, either double-click the .prj file or open the app and browse to the project file.

  Creating a project or opening an existing project causes any other Fixed-Point Converter or MATLAB Coder projects to close.

• A MATLAB Coder project opens in the MATLAB Coder app. To convert the project to a Fixed-Point Converter app project, in the MATLAB Coder app:

  1. Click and select Reopen project as.

  2. Select Fixed-Point Converter.

Examples

• Propose Data Types Based on Simulation Ranges Using the Fixed-Point Converter App
• Propose Data Types Based on Simulation Ranges Using the fiaccel Function
• Propose Data Types Based on Derived Ranges Using the Fixed-Point Converter App

Programmatic Use

fixedPointConverter

fixedPointConverter opens the Fixed-Point Converter app.

fixedPointConverter -tocode projectname

fixedPointConverter -tocode projectname converts the existing project named projectname.prj to the equivalent script of MATLAB commands. It writes the script to the Command Window.

fixedPointConverter -tocode projectname -script scriptname

fixedPointConverter -tocode projectname -script scriptname converts the existing project named projectname.prj to the equivalent script of MATLAB commands. The script is named scriptname.m.

• If scriptname already exists, fixedPointConverter overwrites it.

• The script contains the MATLAB commands to:

  • Create a floating-point to fixed-point conversion configuration object that has the same fixed-point conversion settings as the project.

  • Run the fiaccel command to convert the floating-point MATLAB function to a fixed-point MATLAB function.

Before converting the project to a script, you must complete the Test step of the fixed-point conversion process.

Version History

Introduced in R2014b

R2024b: To be removed

The Fixed-Point Converter app will be removed in a future release. Convert your existing fixed-point conversion projects to MATLAB scripts using the -tocode option of the fixedPointConverter command. For more information, see Convert Fixed-Point Conversion Project to MATLAB Scripts.