Approximate Functions with Lookup Tables

Create and optimize function lookup tables in Simulink®

Using the Lookup Table Optimizer, you can generate memory-efficient lookup tables that approximate functions, subsystems, and blocks. You can also use it to optimize an existing Lookup Table block.

Apps

Lookup Table OptimizerOptimize an existing lookup table or approximate a function with a lookup table

Classes

DataTypeWorkflow.findDecoupledSubsystemsGet a list of subsystems to replace with an approximation
FunctionApproximation.Problem Object defining the function to approximate, or the lookup table to optimize
FunctionApproximation.Options Specify additional options to use with FunctionApproximation.Problem object
FunctionApproximation.LUTSolutionOptimized lookup table data or lookup table data approximating a math function
FunctionApproximation.LUTMemoryUsageCalculatorCalculate memory used by lookup table blocks in a system
LUTCompressionResultOptimized lookup table data for all Lookup Table blocks in a system

Functions

FunctionApproximation.compressLookupTablesCompress all Lookup Table blocks in a system
coder.approximationCreate function replacement configuration object

Topics

Optimize Lookup Tables for Memory-Efficiency

Optimize Lookup Tables using the Lookup Table Optimizer.

Optimize Lookup Tables for Memory-Efficiency Programmatically

Optimize an existing lookup table, generate a lookup table from a Math Function block or function handle.

Approximate Functions with a Direct Lookup Table

Generate direct lookup table approximations of functions or blocks.

Replace Functions in a MATLAB Function Block with a Lookup Table

Automatically replace functions in a MATLAB® Function Block with a lookup table replacement.

Convert Floating-Point Model to Fixed Point

Use the Fixed-Point Tool to convert a floating-point model to fixed point.

Featured Examples

Fixed-Point Function Approximation

Fixed-Point Function Approximation

When a fixed-point library function is not available, fixed-point applications require an approximation of the function. Often, an interpolated look up table is used to store an approximation of the function over a specified range.

Open Script
Calculate Complex dB Using a Direct Lookup Table

Calculate Complex dB Using a Direct Lookup Table

Create an optimized direct lookup table calculating decibel levels.

Open Script
Fixed-Point Prelookup and Interpolation

Fixed-Point Prelookup and Interpolation

Some of the features of Prelookup and Interpolation Using Prelookup blocks.

Open Model
Sharing Parameters in Prelookup and Interpolation Blocks

Sharing Parameters in Prelookup and Interpolation Blocks

How Prelookup and Interpolation blocks share their parameter data in generated code.

Open Model
Convert Neural Network Algorithms to Fixed-Point using fxpopt and Generate HDL Code

Convert Neural Network Algorithms to Fixed-Point using fxpopt and Generate HDL Code

Convert a neural network to fixed point using fixed-point optimization and lookup table optimization.

Open Script
Convert Neural Network Algorithms to Fixed Point and Generate C Code

Convert Neural Network Algorithms to Fixed Point and Generate C Code

Convert a neural network to fixed point using the Fixed-Point Tool and lookup table optimization.

Open Script
Convert Digit Recognition Neural Network to Fixed Point and Generate C Code

Convert Digit Recognition Neural Network to Fixed Point and Generate C Code

Create an embedded efficient neural network using the Fixed-Point Tool and Lookup Table Optimizer.

Open Script
Image Denoising Using Fixed-Point Quantized Restricted Boltzmann Machine Algorithm

Image Denoising Using Fixed-Point Quantized Restricted Boltzmann Machine Algorithm

Convert a Restricted Boltzmann Machine (RBM) algorithm to an embedded-efficient version.

Open Script

Fixed-Point Designer Documentation

Support