Fixed-Point Blockset

Setting Function Parameters for the Lookup Table

To do the examples in this section, you must first set parameter values for the fixpt_look1_func_approx function. To do so, type the following at the MATLAB prompt:

• funcstr = 'sin(2*pi*x)'; %Define the sine function
  xmin = 0; %Set the minimum input of interest
  xmax = 0.25; %Set the maximum input of interest
  xdt = ufix(16); %Set the x data type
  xscale = 2^-16; %Set the x data scaling
  ydt = sfix(16); %Set the y data type
  yscale = 2^-14; %Set the y data scaling
  rndmeth = 'Floor'; %Set the rounding method
  errmax = 2^-10; %Set the maximum allowed error
  nptsmax = 21; %Specify the maximum number of points
  

If you exit MATLAB after typing these commands, you must retype them before trying any of the other examples in this section.

Parameters for fixpt_look1_func_approx

Example 1: Using errmax with Unrestricted Spacing