testmeanshift.m

mean shift算法在聚类中的matlab实现

%testDistCluters

clear
profile on

nPtsPerClust = 250;
nClust  = 3;
totalNumPts = nPtsPerClust*nClust;
m(:,1) = [1 1]';
m(:,2) = [-1 -1]';
m(:,3) = [1 -1]';
var = .6;
bandwidth = .75;
clustMed = [];
%clustCent;


x = var*randn(2,nPtsPerClust*nClust);
%*** build the point set
for i = 1:nClust
    x(:,1+(i-1)*nPtsPerClust:(i)*nPtsPerClust)       = x(:,1+(i-1)*nPtsPerClust:(i)*nPtsPerClust) + repmat(m(:,i),1,nPtsPerClust);   
end

tic
[clustCent,point2cluster,clustMembsCell] = MeanShiftCluster(x,bandwidth);
toc

numClust = length(clustMembsCell);


figure(10),clf,hold on
cVec = 'bgrcmykbgrcmykbgrcmykbgrcmyk';%, cVec = [cVec cVec];
for k = 1:min(numClust,length(cVec))
    myMembers = clustMembsCell{k};
    myClustCen = clustCent(:,k);
    plot(x(1,myMembers),x(2,myMembers),[cVec(k) '.'])
    plot(myClustCen(1),myClustCen(2),'o','MarkerEdgeColor','k','MarkerFaceColor',cVec(k), 'MarkerSize',10)
end
title(['no shifting, numClust:' int2str(numClust)])