l_match.m

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

function match = L_match(Lset,x0)

% match = L_match(Lset,x0)
%
% Matching degree of the crisp value x0 in space X with the fuzzy set
% Lset in space X. Lset is defined in terms of alpha-cuts (level sets).
% The first column defines the levels. The second and third column define 
% the alpha cut of the associated level. The fist row corresponds to the
% highest level alpha=1.
%
% The value is checked for its membership in the level sets. The highest
% level for which the level set contains x0 is choosen as the matching
% degree.

% FSTB - Fuzzy Systems Toolbox for MATLAB
% Copyright (c) 1993-1996 by Olaf Wolkenhauer
% Control Systems Centre at UMIST
% Manchester M60 1QD, UK

% 30-July-1996
% Last change 30 July 1996

[rows,collumns] = find(x0 <= Lset(:,3) & x0 >= Lset(:,2));

if ~isempty(rows),
  match = Lset(min(rows),1);
else,
  match = 0;
end;