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  • Update : 2012-11-26
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【研学堂】【代码】投影寻踪代码,请验用!! function Qa=Project_Pursuit(X,a,Alpha) 输入参数列表 X 本指标矩阵,n×p的矩阵,每一行为一个样本, Xij表示第i行第j列指标,X是否已经归一化均可 a 投影向量,1×p的矩阵,元素取值范围-1~1,要求其元素平方和等于1 Alpha 窗口半径系数,典型取值0.1 输出参数列表 Qa 投影指标函数 第零步:对a的预处理 b=sqrt(sum(a.^2)) a=a/b 第一步:归一化处理 [n,p]=size(X) x=zeros(n,p) Xjmax=max(X) Xjmin=min(X) for i=1:n x(i,:)=(X(i,:)-Xjmin)./(Xjmax-Xjmin) end 第二步:构造投影指标值 Z=zeros(n,1) for i=1:n Z(i)=sum(a.*x(i,:)) end 第三步:计算投影指标函数 计算类间类内矩阵散度 meanZ=mean(Z) Sa=0 for k=1:n sa=(Z(i)-meanZ(i)).^2 Sa=Sa+sa Sa=sqrt(Sa/n) end R=Alpha*Sa 窗口半径 Da=0 for k=1:n rik=abs(Z(i)-Z(k)) if R>rik Da=Da+rik Da=Da+R-rik end end Qa=Sa*Da
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