Fixed Point Function Replacement and Data Visualization

Replacement of fixed-point runtime library functions and using coder.approximate

Learn about function replacement and plotting data and visualization support for code generation, and data type specification.

Functions

`codegen`	Generate HDL or High-Level Synthesis (HLS) code from MATLAB code
`coder.config`	Create HDL Coder code generation configuration objects
`coder.approximation`	Create function replacement configuration object
`coder.float2fixed.skip`	Exclude functions from fixed-point conversion (Since R2024b)

Classes

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

Topics

Function Replacement

Replacing Functions Using Lookup Table Approximations
The Fixed-Point Designer™ MATLAB^® Coder™ software provides an option to generate lookup table approximations for continuous and stateless single-input, single-output functions in your original MATLAB code.
Replace a Custom Function with a Lookup Table
With HDL Coder™, you can generate lookup table approximations for functions that do not support fixed-point types, and replace your own functions.
Replace the exp Function with a Lookup Table
With HDL Coder, you can handle functions that are not supported for fixed point and replace your own functions.

Plotting Data and Visualization

Enable Plotting Using the Simulation Data Inspector
You can use the Simulation Data Inspector to inspect and compare floating-point and fixed-point logged input and output data.
Visualize Differences Between Floating-Point and Fixed-Point Results
To complete this example, you must install the following products:
Log Data for Histogram
To log data for histograms:
View and Modify Variable Information
View and modify variable information for fixed-point conversion.

Featured Examples

Generate HDL-Compatible Lookup Table Function Replacements Using coder.approximate

MATLAB® code generation from a floating-point MATLAB design that is not ready for code generation. Use coder.approximate function to generate a lookup table based MATLAB function. This newly generated function is ready for HDL code generation (not shown in this demo).

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