Fixed-Point Blockset

Creating Lookup Tables for a Sine Function

This section explains how to use the function fixpt_look1_func_approx to create lookup tables. It gives examples that show how to create lookup tables for the function sin(2x) on the interval from 0 to .25. The section covers

• Parameters for fixpt_look1_func_approx
• Setting Function Parameters for the Lookup Table
• Example 1: Using errmax with Unrestricted Spacing
• Example 2: Using nptsmax with Unrestricted Spacing
• Restricting the Spacing
• Example 3: Using errmax with Even Spacing
• Example 4: Using nptsmax with Even Spacing
• Example 5: Using errmax with Power of Two Spacing
• Example 6: Using nptsmax with Power of Two Spacing
• Specifying Both errmax and nptsmax
• Comparing the Examples

Worst Case Error for a Lookup Table

Parameters for fixpt_look1_func_approx