Manual Fixed-Point Conversion in MATLAB

Assisted floating-point algorithm to fixed-point algorithm conversion

Use the buildInstrumentedMex function to instrument your algorithm for logging minimum and maximum values of all named and intermediate variables. Use the showInstrumentationResults function to propose fixed-point data types based on these logged values.

Functions

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buildInstrumentedMexGenerate compiled C code function including logging instrumentation
showInstrumentationResultsResults logged by instrumented, compiled C code function
clearInstrumentationResultsClear results logged by instrumented, compiled C code function
fiConstruct fixed-point numeric object
fimathSet fixed-point math settings
numerictypeConstruct an embedded.numerictype object describing fixed-point or floating-point data type
eyeCreate identity matrix with fixed-point properties
onesCreate array of all ones with fixed-point properties
zerosCreate array of all zeros with fixed-point properties
castCast variable to different data type
cast64BitFiToIntCast fi object types that can be exactly represented to a 64-bit integer data type
cast64BitIntToFiCast 64-bit integer types to an equivalent fi object type
castFiToIntCast fi object to equivalent integer data type
castFiToMATLABCast fi object type to an equivalent built-in MATLAB data type
castIntToFiCast an integer data type to equivalent fi type

Topics

Fixed-Point Conversion Workflows

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

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.

Manual Fixed-Point Conversion Workflow

Learn about workflow for manual float-to-fixed conversion.

Manual Fixed-Point Conversion Best Practices

Get from generic MATLAB® code to an efficient fixed-point implementation using manual fixed-point conversion.

Manually Convert a Floating-Point MATLAB Algorithm to Fixed Point

Manual conversion of a floating-point MATLAB algorithm to fixed point.

Know When a Function is Supported for Instrumentation and Acceleration

Determine which functions are supported for fixed-point conversion.

Related Information

Troubleshooting

Resolve Error: Function is not Supported for Fixed-Point Conversion

Troubleshoot functions that are not supported for fixed-point conversion.

Resolve Error: fi*non-fi

Troubleshoot fi*non-fi errors.

Resolve Error: Data Type Mismatch

Troubleshoot data type mismatch errors.

Resolve Error: Mismatched fimath

Troubleshoot mismatched fimath errors.

Featured Examples

Set Data Types Using Min/Max Instrumentation

Set Data Types Using Min/Max Instrumentation

Set fixed-point data types by instrumenting MATLAB code for min/max logging and using the tools to propose data types.

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Convert Fast Fourier Transform (FFT) to Fixed Point

Convert Fast Fourier Transform (FFT) to Fixed Point

Convert a version of the Fast Fourier Transform (FFT) algorithm into fixed-point MATLAB code.

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Implement FIR Filter Algorithm for Floating-Point and Fixed-Point Types using cast and zeros

Implement FIR Filter Algorithm for Floating-Point and Fixed-Point Types using cast and zeros

Convert a finite impulse-response (FIR) filter to fixed point by separating the fixed-point type specification from the algorithm code.

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Detect Limit Cycles in Fixed-Point State-Space Systems

Detect Limit Cycles in Fixed-Point State-Space Systems

Analyze a fixed-point state-space system to detect limit cycles.

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Compute Quantization Error

Compute Quantization Error

Compute and compare the statistics of the signal quantization error when using various rounding methods.

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Fixed-Point Designer Documentation

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