modi_set.m

FISMAT accommodates different arithmetic operators, fuzzification and defuzzification algorithm, imp

function f = modi_set(set,mod)

% f = modi_set(set,mod)
%
% Modification of a fuzzy set, or a library of fuzzy sets.
% 'mod'  :
%
% 'nor'   normalisation. Division of all elements by the maximum membership-
%                        value of the set.
% 'con'   concentration. Con(u(x)) = u(x)}. Makes the set more "crisp".
%                        operator for the linguistic "very".
% 'dil'   dilation.      Dil(ua) = u(x)^0.5. Makes the set more fuzzy.
%                        operator for the linguistic "more or less".
% 'int'   contrast-intensivation. 
%                        Int(u(x)) = 2*u(x)} if u(x) < 0.5 else 1-2*(1-u(x))}
%
%
% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK
%
% 25-Feb-1994
 
[m,resx]=size(set);
f=zeros(m,resx);
for row=1:m,
  if all(mod(1:3)=='nor') 
    f(row,:)=set(row,:)./max(set(row,:));
  elseif all(mod(1:3)=='con')
    f(row,:)=set(row,:).^2;
  elseif all(mod(1:3)=='dil')
    f(row,:)=set(row,:).^0.5; 
  elseif all(mod(1:3)=='int')
    for i=1:resx;
      if set(row,i)<0.5,f(row,i)=2*set(row,i)^2;
      else f(row,i)=1-2*(1-set(row,i))^2;end;
    end; 
  end;
end;