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xiaxiaozhi

гæ (³õÈëÎÄ̳)

[ÇóÖú] matlabµÄ¾ÛÀà·ÖÎö

n = 300 ;
c = 3;
t = randperm(n) ;
x = [randn(1,n/3)-2 randn(1,n/3) randn(1,n/3)+2 ;
     randn(1,n/3) randn(1,n/3)+4 randn(1,n/3)]' ;

m = x(t(1:c), ;
x2 = sum(x.^2,2) ;
s0(1:c,1)=inf;
for o = 1 : 100
        m2 = sum(m.^2,2) ;
        [d,y] = min(repmat(m2,1,n)+repmat(x2',c,1)-2*m*x') ;
        for j = 1 : c
            m(j, = mean(x(y==j,) ;
           s(j,1) = mean(d(y==j)) ;
        end
        % norm£¨A£© ·µ»Ø¾ØÕóAµÄ¶þ·¶Êý
        % ¾ØÕóµÄ¶þ·¶Êý £º A' * A µÄ×î´óÌØÕ÷Öµ¿ªÆ½·½
        % A = [0 1 2 ; 3 4 5 ; 6 7 8] ;
        % norm£¨A£© = sqrt(max(eig(A'*A))) = 14.2267
        if norm(s-s0) < 0.001
            break ;
        end
        s0 = s ;
end
figure(1) ;%´´½¨Í¼Ðδ°¿Ú
clf ;%Çå³ýµ±Ç°Í¼Ïñ´°¿Ú
hold on ;
plot(x(y==1,1),x(y==1,2),'bo') ;
plot(x(y==2,1),x(y==2,2),'rx') ;
plot(x(y==3,1),x(y==3,2),'gv') ;

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