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  • 大小: 5KB
    文件類型: .m
    金幣: 1
    下載: 1 次
    發布日期: 2021-05-25
  • 語言: Matlab
  • 標簽:

資源簡介

基于密度峰值快速搜索發現聚類中心的聚類算法源代碼。

資源截圖

代碼片段和文件信息

clear?all
close?all
disp(‘The?only?input?needed?is?a?distance?matrix?file‘)
disp(‘The?format?of?this?file?should?be:?‘)
disp(‘Column?1:?id?of?element?i‘)
disp(‘Column?2:?id?of?element?j‘)
disp(‘Column?3:?dist(ij)‘)
mdist=input(‘name?of?the?distance?matrix?file\n‘‘s‘);
disp(‘Reading?input?distance?matrix‘)
xx=load(mdist);
ND=max(xx(:2));
NL=max(xx(:1));
if?(NL>ND)
??ND=NL;
end
N=size(xx1);
for?i=1:ND
??for?j=1:ND
????dist(ij)=0;
??end
end
for?i=1:N
??ii=xx(i1);
??jj=xx(i2);
??dist(iijj)=xx(i3);
??dist(jjii)=xx(i3);
end
percent=2.0;
fprintf(‘average?percentage?of?neighbours?(hard?coded):?%5.6f\n‘?percent);

position=round(N*percent/100);
sda=sort(xx(:3));
dc=sda(position);

fprintf(‘Computing?Rho?with?gaussian?kernel?of?radius:?%12.6f\n‘?dc);


for?i=1:ND
??rho(i)=0.;
end
%
%?Gaussian?kernel
%
for?i=1:ND-1
??for?j=i+1:ND
?????rho(i)=rho(i)+exp(-(dist(ij)/dc)*(dist(ij)/dc));
?????rho(j)=rho(j)+exp(-(dist(ij)/dc)*(dist(ij)/dc));
??end
end
%
%?“Cut?off“?kernel
%
%for?i=1:ND-1
%??for?j=i+1:ND
%????if?(dist(ij)%???????rho(i)=rho(i)+1.;
%???????rho(j)=rho(j)+1.;
%????end
%??end
%end

maxd=max(max(dist));

[rho_sortedordrho]=sort(rho‘descend‘);
delta(ordrho(1))=-1.;
nneigh(ordrho(1))=0;

for?ii=2:ND
???delta(ordrho(ii))=maxd;
???for?jj=1:ii-1
?????if(dist(ordrho(ii)ordrho(jj))????????delta(ordrho(ii))=dist(ordrho(ii)ordrho(jj));
????????nneigh(ordrho(ii))=ordrho(jj);
?????end
???end
end
delta(ordrho(1))=max(delta(:));
disp(‘Generated?file:DECISION?GRAPH‘)
disp(‘column?1:Density‘)
disp(‘column?2:Delta‘)

fid?=?fopen(‘DECISION_GRAPH‘?‘w‘);
for?i=1:ND
???fprintf(fid?‘%6.2f?%6.2f\n‘?rho(i)delta(i));
end

disp(‘Select?a?rectangle?enclosing?cluster?centers‘)
scrsz?=?get(0‘ScreenSize‘);
figure(‘Position‘[6?72?scrsz(3)/4.?scrsz(4)/1.3]);
for?i=1:ND
??ind(i)=i;
??gamma(i)=rho(i)*delta(i);
end
subplot(211)
tt=plot(rho(:)delta(:)‘o‘‘MarkerSize‘5‘MarkerFaceColor‘‘k‘‘MarkerEdgeColor‘‘k‘);
title?(‘Decision?Graph‘‘FontSize‘15.0)
xlabel?(‘\rho‘)
ylabel?(‘\delta‘)


subplot(211)
rect?=?getrect(1);
rhomin=rect(1);
deltamin=rect(2);
NCLUST=0;
for?i=1:ND
??cl(i)=-1;
end
for?i=1:ND
??if?(?(rho(i)>rhomin)?&&?(delta(i)>deltamin))
?????NCLUST=NCLUST+1;
?????cl(i)=NCLUST;
??

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