gradecalc.m

用于汽车巡航控制系统的模糊控制算法

function [grade] = GradeCalc(x, b1, b2, c)

% function [grade] = GradeCalc(x, b1, b2, c)
% Compute the membership grade of a number in a triangular fuzzy set.

% INPUTS
%   x = input value.
%   b1 = width of left half of membership triangle (lower half width).
%   b2 = width of right half of membership triangle (upper half width).
%   c = center point of membership triangle.
% OUTPUTS
%   grade = membership grade

if x >= (c + b2)
	grade = 0;
elseif x <= (c - b1)
  	grade = 0;
elseif x >= c
   grade = (c + b2 - x) / b2;
else
   grade = (-c + b1 + x) / b1;
end