Matlab kmeans聚类
rng('default') % For reproducibility
X = [randn(100,2)*0.75+ones(100,2);
randn(100,2)*0.5-ones(100,2);
randn(100,2)*0.75];
[idx,C] = kmeans(X,3);
figure(5);
gscatter(X(:,1),X(:,2),idx,'bgm')
hold on
plot(C(:,1),C(:,2),'kx')
legend('Cluster 1','Cluster 2','Cluster 3','Cluster Centroid')
参考：https://ww2.mathworks.cn/help/stats/kmeans.html
###########