如果运行代码报错，
查出Y1 = mdscale(dist, 2, 'criterion','metricsstress');这句报错
??? Error using ==> mdscale>metricStressCrit at 686
Points in the configuration have co-located. Try a different starting point, or use a different criterion.
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Error in ==> mdscale>MDS at 498
[stress,grad] = feva l_r(stressFun, Y, disparities, weights);
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Error in ==> mdscale at 404
[Y,stress,iter] = MDS(Y0,dissimilarities,weights,stressFun,metric,weighted,options);
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Error in ==> cluster_dp at 181
可以修改最后一个参数，把它改成'metricsstress' 或 'sammon' 或 'strain'
??