searchupper.m

模糊聚类分析中在搜索矩阵的判定指标

function [mub,it] = searchMub(vDist,cv_mub,epsilon,itmax); 
%   function [mub,it] = searchMub(vDist,cv_mub,epsilon,itmax); 
% 
%   Search for upper bound value of fuzzy parameter 
% 
%   vDist   = vector of distances between samples of data set 
%   cv_mub  = minimum cv which gives no clustering structure 
%   epsilon = scalar (stopping rule 1) 
%   itmax   = maximum number of iterations (stopping rule 2) 
% 
%   Write by : DD 
%       date : 2001/06/24 
 
Yo = vDist/max(vDist); 
cv = std(Yo)/mean(Yo); 
mubMax = 1000; % can be adjusted by user 
it = 1; 
if (abs(cv-cv_mub)cv_mub) 
        m1 = 2; 
        m2 = mubMax; 
    else 
        m1 = 1+epsilon; 
        m2 = 2; 
    end  
    while ((itepsilon)) 
        m = (m1+m2)/2; 
        d = 1/(m-1); 
        Y = Yo.^d; 
        cv = std(Y)/mean(Y); 
        if (abs(cv-cv_mub)cv_mub) 
            m1 = m; 
        else   
            m2 = m; 
        end 
        it = it+1; 
    end 
end 
return; %% end of function searchMub.m;