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tcfx1989

Ìú³æ (³õÈëÎÄ̳)

[ÇóÖú] ³õѧÕßPCA´úÂëÇóÖú£¬Ð»Ð»£¡

function PCA(X)
%*************Ö÷³É·Ý·ÖÎö************
%
%see also http://www.matlabsky.com
%
%¶ÁÈëÎļþÊý¾Ý
%X=load('data.txt');
%==========·½·¨1:Çó±ê×¼»¯ºóµÄЭ²î¾ØÕó,ÔÙÇóÌØÕ÷¸ùºÍÌØÕ÷ÏòÁ¿=================
%±ê×¼»¯´¦Àí
meanValue = mean(X,2);
[m,n] = size(X);
%mixedsig = mixedsig - meanValue*ones(1,size(meanValue)); %µ±Êý¾Ý±¾ÉíάÊýºÜ´óʱÈÝÒ׳öÏÖOut of memory
for s =  1:m
    for t = 1:n
        X(s,t) = X(s,t) - meanValue(s);
    end
end
sigmaY=(X'*X)/(n-1)
%ÇóX±ê×¼»¯µÄЭ²î¾ØÕóµÄÌØÕ÷¸ùºÍÌØÕ÷ÏòÁ¿
[T,lambda]=eig(sigmaY);
disp('ÌØÕ÷¸ù(ÓÉСµ½´ó):');
disp(lambda);
disp('ÌØÕ÷ÏòÁ¿:');
disp(T);




T,lambda]=eig(sigmaY);
disp('ÌØÕ÷¸ù(ÓÉСµ½´ó):');¹Ø¼ü¾ÍÊÇÕâ¿é²»Ã÷°×£¬·Ö½âºóÔõô¾ÍÖ±½ÓËµÌØÕ÷¸ùÓÉСµ½´ó£¬ÄѵÀeigºólambdaÖеÄÌØÕ÷ÖµÑØ¶Ô½ÇÏßÓÉСµ½´óÅÅÐòµÄÂð£¿
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