% this is a note for a data-modeling case;
%https://ww2.mathworks.cn/content/dam/mathworks/mathworks-dot-com/academia/student-competitions/cumcm/lecture-10-matlab-cumcm-zhenti-solution-example-1-data-type.pdf
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%silhouette 函数用来评价分类结果的好坏，详见https://ww2.mathworks.cn/help/stats/silhouette.html
% 横轴 silhouette ：[-1 1],越大越好
% 纵轴 class: 每个样本