Implement Lookup Tables in MATLAB

Replace computationally-intense functions with lookup tables

Lookup tables are an efficient way to write computationally-intense functions for fixed-point embedded devices. For example, you can efficiently implement logarithm, sine, cosine, tangent, and square-root using lookup tables.

Topics

Replace the exp Function with a Lookup Table

Replace a function with a lookup table approximation in fixed-point code generated with the Fixed-Point Converter app.

Replace a Custom Function with a Lookup Table

Replace a custom function with a lookup table approximation function by using the Fixed-Point Converter app.

Featured Examples

Normalize Data for Lookup Tables

Normalize Data for Lookup Tables

Normalize data for use in lookup tables.

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Implement Fixed-Point Log2 Using Lookup Table

Implement Fixed-Point Log2 Using Lookup Table

Implement fixed-point log2 using a lookup table. Lookup tables generate efficient code for embedded devices.

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Implement Fixed-Point Square Root Using Lookup Table

Implement Fixed-Point Square Root Using Lookup Table

Implement fixed-point square root using a lookup table.

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Calculate Fixed-Point Arctangent

Calculate Fixed-Point Arctangent

Use the CORDIC algorithm, polynomial approximation, and lookup table approaches to calculate the fixed-point, four quadrant inverse tangent.

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Calculate Fixed-Point Sine and Cosine

Calculate Fixed-Point Sine and Cosine

Use both CORDIC-based and lookup table-based algorithms provided by Fixed-Point Designer to approximate the MATLAB sine and cosine functions.

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