{"id":2485,"date":"2023-04-05T11:18:03","date_gmt":"2023-04-05T03:18:03","guid":{"rendered":"http:\/\/103.118.41.220\/docs\/?p=2485"},"modified":"2024-04-07T21:41:01","modified_gmt":"2024-04-07T13:41:01","slug":"mds","status":"publish","type":"post","link":"https:\/\/www.khsci.com\/docs\/index.php\/2023\/04\/05\/mds\/","title":{"rendered":"MDS\u964d\u7ef4\u7b97\u6cd5"},"content":{"rendered":"\n

\u4e00\u3001\u4ee3\u7801\u8fd0\u884c\u73af\u5883<\/strong><\/h4>\n\n\n\n

MATLAB2014b\u53ca\u66f4\u65b0\u7248\u672c\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u7a0b\u5e8f\u4ecb\u7ecd<\/strong><\/h4>\n\n\n
\n
\"\u6b64\u56fe\u50cf\u7684alt\u5c5e\u6027\u4e3a\u7a7a\uff1b\u6587\u4ef6\u540d\u4e3aimage.png\"\/<\/figure><\/div>\n\n\n
\"\u6b64\u56fe\u50cf\u7684alt\u5c5e\u6027\u4e3a\u7a7a\uff1b\u6587\u4ef6\u540d\u4e3aimage-5.png\"\/<\/figure>\n\n\n\n

1.demo_MDS.m\u6587\u4ef6<\/strong><\/p>\n\n\n\n

MDS\u964d\u7ef4\u51fd\u6570kMDS.m\u7684\u6d4b\u8bd5\u811a\u672c\u6587\u4ef6\uff0c\u53ef\u4ee5\u76f4\u63a5\u8fd0\u884c\u3002\u7a0b\u5e8f\u8fd0\u884c\u5b8c\u6210\u540e\uff0c\u4f1a\u7ed8\u5236\u51fa\u5982\u4e0b\u4e00\u5f20\u56fe\uff1a<\/p>\n\n\n

\n
\"\u6b64\u56fe\u50cf\u7684alt\u5c5e\u6027\u4e3a\u7a7a\uff1b\u6587\u4ef6\u540d\u4e3aimage-1.png\"\/<\/figure><\/div>\n\n\n

\u6b64\u65f6\u5728\u5de5\u4f5c\u533a\u80fd\u627e\u5230MDS\u964d\u7ef4\u540e\u7684\u53d8\u91cf\uff1amdsVal<\/p>\n\n\n

\n
\"\u6b64\u56fe\u50cf\u7684alt\u5c5e\u6027\u4e3a\u7a7a\uff1b\u6587\u4ef6\u540d\u4e3aimage-2.png\"\/<\/figure><\/div>\n\n\n

\u53e6\u5916\uff1aoptions.NumDimensions = 2<\/p>\n\n\n\n

\u6539\u6210\uff1aoptions.NumDimensions = 3<\/p>\n\n\n\n

\u4e4b\u540e\uff0c\u91cd\u65b0\u8fd0\u884c\uff0c\u5c06\u4f1a\u7ed8\u5236\u51fa\u4e0b\u56fe\uff1a<\/p>\n\n\n

\n
\"\u6b64\u56fe\u50cf\u7684alt\u5c5e\u6027\u4e3a\u7a7a\uff1b\u6587\u4ef6\u540d\u4e3aimage-3.png\"\/<\/figure><\/div>\n\n\n

2.kMDS.m\u6587\u4ef6<\/strong><\/p>\n\n\n\n

MDS\u964d\u7ef4\u548c\u753b\u56fe\u7684\u4e3b\u51fd\u6570\u6587\u4ef6\u3002<\/p>\n\n\n\n

MDS\u964d\u7ef4\u4ee5\u53ca\u753b\u56fe\u529f\u80fd\u5168\u90e8\u5c01\u88c5\u5728\u6b64\u51fd\u6570\u3002\u6ce8\u610f\u4e0d\u80fd\u76f4\u63a5\u8fd0\u884c\u8be5\u51fd\u6570\u6587\u4ef6<\/strong>\uff0c\u800c\u8981\u53c2\u7167demo_MDS.m\u6587\u4ef6<\/strong>\u7684\u5199\u6cd5\u8fdb\u884c\u51fd\u6570\u8c03\u7528\u3002<\/p>\n\n\n\n

\u4ee3\u7801\u6ce8\u91ca\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n\n\n

function mdsVal = kMDS(Fea, options, species,figflag)\n%% \u6267\u884c\u6570\u636e\u7684MDS\u964d\u7ef4\n%% \u53ef\u4ee5\u5b9e\u73b02\u7ef4\u30013\u7ef4\u4ee5\u53ca\u66f4\u9ad8\u7ef4\u5ea6\u7684\u964d\u7ef4\uff0c\u53ea\u6709\u4e8c\u7ef4\u548c\u4e09\u7ef4\u53ef\u4ee5\u753b\u56fe\n% \u8f93\u5165\uff1a\n% Fea\uff1a\u5f85\u964d\u7ef4\u6570\u636e\uff0cR*Q\u7684\u77e9\u9635\uff0cR\u4e3a\u6279\u6b21\u6570\uff0cQ\u4e3a\u7279\u5f81\u7ef4\u5ea6\uff0c\u4f8b\u5982\u7279\u5f81\u7ef4\u5ea6\u4e3a8\u7684\u5171100\u7ec4\u6570\uff0ctempFea\u7684\u7ef4\u5ea6\u5e94\u4e3a100*8\u3002\u8f93\u5165\u8be5\u53d8\u91cf\u65f6\u4e00\u5b9a\u8981\u6ce8\u610f\u884c\u5217\u65b9\u5411\u662f\u5426\u6b63\u786e\uff0c\u5982\u4e0d\u6b63\u786e\u9700\u8981\u8f6c\u7f6e\n% options\uff1a\u4e00\u4e9b\u4e0eMDS\u964d\u7ef4\u6709\u5173\u7684\u8bbe\u7f6e\uff0c\u4f7f\u7528\u7ed3\u6784\u4f53\u65b9\u5f0f\u8d4b\u503c\uff0c\u6bd4\u5982 options.Distance = 'euclidean' \uff0c\u5177\u4f53\u5305\u62ec\uff1a\n%              -Distance\uff1a\u8ddd\u79bb\u91cf\u5ea6\u65b9\u6cd5\u9009\u62e9\uff0c\u53ef\u9009\uff1a'euclidean' (default) | 'seuclidean' | 'cityblock' | 'chebychev' | 'minkowski' | 'mahalanobis' | 'cosine' | 'correlation' | 'spearman' | 'hamming' | 'jaccard'\n%                         \u5177\u4f53\u63cf\u8ff0\u89c1\uff1ahttps:\/\/ww2.mathworks.cn\/help\/stats\/pdist.html?s_tid=doc_ta#mw_39296772-30a1-45f3-a296-653c38875df7\n%              -NumDimensions\uff1a\u964d\u7ef4\u540e\u7684\u6570\u636e\u7ef4\u5ea6\uff0c\u9ed8\u8ba4\u4e3a2\n% species\uff1a\u5206\u7ec4\u53d8\u91cf\uff0c\u53ef\u4ee5\u662f\u6570\u7ec4\u3001\u6570\u503c\u5411\u91cf\u3001\u5b57\u7b26\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u6570\u7ec4\u7b49\uff0c\u4f46\u662f\u9700\u8981\u6ce8\u610f\u6b64\u53d8\u91cf\u7ef4\u5ea6\u9700\u8981\u4e0eFea\u7684\u7ec4\u6570\u4e00\u81f4\u3002\u8be5\u53d8\u91cf\u53ef\u4ee5\u4e0d\u8d4b\u503c\uff0c\u8c03\u7528\u65f6\u5bf9\u5e94\u4f4d\u7f6e\u5199\u4e3a[]\u5373\u53ef\n%          \u4f8b\u5982species\u53ef\u4ee5\u662f[1,1,1,2,2,2,3,3,3]\u8fd9\u6837\u7684\u6570\u7ec4\uff0c\u4ee3\u8868\u4e86Fea\u524d3\u884c\u6570\u636e\u4e3a\u7b2c1\u7ec4\uff0c4-6\u884c\u6570\u636e\u4e3a\u7b2c2\u7ec4\uff0c7-9\u884c\u6570\u636e\u4e3a\u7b2c\u4e09\u7ec4\u3002\n%          \u5173\u4e8e\u6b64species\u53d8\u91cf\u66f4\u591a\u4fe1\u606f\uff0c\u53ef\u4ee5\u67e5\u770b\u4e0b\u8ff0\u94fe\u63a5\u4e2d\u7684"Grouping variable"\uff1a\n%          https:\/\/ww2.mathworks.cn\/help\/stats\/gscatter.html?s_tid=doc_ta#d124e492252\n% \n% figflag\uff1a\u662f\u5426\u753b\u56fe\uff0c'on'\u4e3a\u753b\u56fe\uff0c'off'\u4e3a\u4e0d\u753b\uff0c\u53ea\u6709NumDimensions\u4e3a2\u6216\u80053\u65f6\u8d77\u4f5c\u7528\uff0c3\u4ee5\u4e0a\u65e0\u6cd5\u753b\u56fe\n<\/code><\/pre>\n\n\n\n
\u4e09\u3001\u5feb\u901f\u5f00\u59cb<\/h4>\n\n\n\n
1.\u8fd0\u884c\u6d4b\u8bd5\u811a\u672c<\/strong><\/p>\n\n\n\n
\u5148\u5728MATLAB\u91cc\u6253\u5f00\u4e0b\u8f7d\u597d\u7684\u6587\u4ef6\u5939\uff0c\u7136\u540e\u8fd0\u884cdemo_MDS.m<\/strong>\u7a0b\u5e8f\uff0c\u7a0b\u5e8f\u8fd0\u884c\u5b8c\u6bd5\u540e\u5982\u679c\u6ca1\u62a5\u9519\uff0c\u4e14\u6b63\u5e38\u753b\u51fa\u5206\u5e03\u56fe\u50cf\uff0c\u5219\u8bf4\u660e\u8fd0\u884c\u73af\u5883\u6b63\u5e38\uff0c\u7a0b\u5e8f\u6b63\u786e\u3002<\/p>\n\n\n\n
2.\u4fee\u6539\u4eff\u771f\u6570\u636e\/\u5bfc\u5165\u6570\u636e<\/strong><\/p>\n\n\n\n
\u590d\u5236\u4e00\u4e2ademo_MDS.m<\/strong>\u7684\u6587\u4ef6\u526f\u672c\uff0c\u5728\u8fd9\u4e2a\u526f\u672c\u91cc\u505a\u5982\u4e0b\u4fee\u6539\uff1a<\/p>\n\n\n\n
\uff081\uff09\u7b2c\u4e00\u79cd\u60c5\u51b5\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u5bf9\u4f60\u81ea\u5df1\u8981\u7814\u7a76\u7684\u6570\u636e<\/strong>\u8fdb\u884c\u964d\u7ef4\uff0c\u6b64\u65f6\u4f60\u9700\u8981\u5bf9 demo_MDS.m<\/strong> \u811a\u672c\u6587\u4ef6\u4e2d\u7684\u7b2c1\u5c0f\u8282\u5185\u5bb9\u8fdb\u884c\u4fee\u6539\u66ff\u6362\u5373\u53ef\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8bf7\u6700\u597d\u4fdd\u6301\u53d8\u91cf\u540d\u7684\u4e00\u81f4<\/strong>\uff0c\u5373\u5c06\u5f85\u964d\u7ef4\u7684\u77e9\u9635\u547d\u540d\u4e3adata\u3002\u6b64\u65f6\u6570\u636e\u66ff\u6362\u5b8c\u6210\u3002<\/p>\n\n\n\n
\uff082\uff09\u7b2c\u4e8c\u79cd\u60c5\u51b5\uff0c\u4f60\u53ef\u80fd\u662f\u60f3\u5bf9\u4e00\u6bb5\u771f\u5b9e\u91c7\u96c6<\/strong>\u7684\u6570\u636e\u8fdb\u884c\u6ee4\u6ce2\uff0c\u6b64\u65f6\u9700\u8981\u6839\u636e\u4f60\u7684\u6587\u4ef6\u7c7b\u578b\u7684\u4e0d\u540c\uff08excel,txt,csv\u7b49\uff09\uff0c\u5c06\u6570\u636e\u5bfc\u5165MATLAB\u7684\u65b9\u6cd5\u6709\u6240\u4e0d\u540c\u3002\u540c\u5b66\u4eec\u53ef\u4ee5\u770b\u535a\u4e3b\u9488\u5bf9\u5e38\u7528\u6587\u4ef6\u7684\u5bfc\u5165\u65b9\u6cd5\u7684\u8fd9\u4e2a\u6559\u7a0b<\/a>\uff0c\u6559\u7a0b\u4e0a\u672a\u5305\u542b\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5927\u5bb6\u53ef\u4ee5\u518d\u53c2\u8003\u8fd9\u4e2a\u6587\u6863<\/a>\u3002\u5bfc\u5165\u5b8c\u6210\u540e\u8bf7\u5c06\u8fd9\u4e2a\u5f85\u964d\u7ef4\u4fe1\u53f7\u547d\u540d\u4e3adata<\/strong>\u3002<\/p>\n\n\n\n
3.\u5b9e\u73b0demo_MDS\u964d\u7ef4<\/strong><\/p>\n\n\n\n
\u53c2\u7167 demo_MDS.m<\/strong>\u6587\u4ef6\u4e2d\u7b2c\u4e8c\u6b65\uff0c\u6309\u7167\u5b9e\u9645\u9700\u6c42\u8bbe\u7f6eoptions.NumDimensions \u3001options.Distance\u53cafigflag\u7b49\u53c2\u6570\u7684\u503c\u3002<\/p>\n\n\n\n
\u8fd0\u884c\u7a0b\u5e8f\u5373\u53ef\u3002<\/p>\n\n\n\n
\u56db\u3001\u5173\u4e8e\u5b8c\u6574\u7248\u4e0e\u516c\u5f00\u7248\u4ee3\u7801<\/h4>\n\n\n\n
\u529f\u80fd<\/strong><\/td>\u5b8c\u6574\u7248<\/strong><\/td>\u516c\u5f00\u7248<\/strong><\/td><\/tr>
\u6570\u636e\u5bfc\u5165\u3001\u53c2\u6570\u8bbe\u7f6e\u3001\u5b9e\u73b0MDS\u964d\u7ef4<\/td>\u221a<\/td>\u221a<\/td><\/tr>
\u8f6f\u4ef6\u5168\u90e8\u6e90\u7801\uff08\u51fd\u6570m\u6587\u4ef6\uff09<\/td>\u221a<\/td>\u00d7<\/td><\/tr>
\u753b\u56fe\u65e0\u6c34\u5370<\/td>\u221a<\/td>\u00d7<\/td><\/tr>
\u964d\u7ef4\u6570\u636e\u957f\u5ea6<\/td>\u65e0\u9650\u5236<\/td>150\u4ee5\u5185<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u4e94\u3001\u83b7\u53d6\u516c\u5f00\u7248\u7a0b\u5e8f\uff08\u9700\u4f7f\u7528\u7535\u8111\u6d4f\u89c8\u5668\u6253\u5f00\uff09<\/h4>\n\n\n\n
\n\n    
\n                
MDS\u4ee3\u7801\uff08\u516c\u5f00\u7248\uff09<\/h3>\n        
\n                    
\u6587\u4ef6\u5c3a\u5bf8: 19.77 KB<\/div>\n                    
\u66f4\u65b0: 18-06-2023<\/div>\n        <\/div>\n    <\/div>\n    
\n                \n                    <\/g><\/svg>\n                    \u4e0b\u8f7d<\/span>\n                <\/a>\n    <\/div>\n<\/div>\n\n\n\n\n
\u6ce8\uff1a\u516c\u5f00\u7248\u4ee3\u7801\u9700\u4f7f\u7528MATLAB2022a\u53ca\u4ee5\u4e0a\u7248\u672c<\/p>\n\n\n\n
\u516d\u3001\u83b7\u53d6\u5b8c\u6574\u7248\u7a0b\u5e8f\uff08\u4f7f\u7528\u7535\u8111\u6d4f\u89c8\u5668\u6216\u8005\u624b\u673a\u6d4f\u89c8\u5668\u6253\u5f00\uff09<\/h4>\n\n\n\n
\u83b7\u53d6\u901a\u9053\u4e00\uff08\u6dd8\u5b9d\uff09\uff1a<\/strong>\u70b9\u51fb\u6b64\u5904\u83b7\u53d6\u5b8c\u6574\u7248\u7a0b\u5e8f<\/a><\/p>\n\n\n\n
\u83b7\u53d6\u901a\u9053\u4e8c\uff08\u672c\u9875\u9762\uff09\uff1a<\/strong>\u70b9\u51fb\u4e0b\u9762\u201c\u7acb\u5373\u652f\u4ed8\u201d\u6309\u94ae\uff0c\u4ed8\u6b3e\u540e\u83b7\u53d6\u5b8c\u6574\u7248\u4ee3\u7801\u4e0b\u8f7d\u94fe\u63a5\u548c\u552e\u540e\u8054\u7cfb\u65b9\u5f0f~\u672c\u901a\u9053\u5904\u4e8e\u6d4b\u8bd5\u9636\u6bb5\uff0c\u4f7f\u7528\u8be5\u901a\u9053\u53ef\u4ee5\u989d\u5916\u4f18\u60e0\uff08\u4ec5\u970039\u5143\uff09\u3002\u4ed8\u6b3e\u5b8c\u6210\u540e\u5237\u65b0\u4e00\u4e0b\u672c\u9875\u9762\u5373\u53ef\u770b\u5230\u4e0b\u8f7d\u94fe\u63a5\u3002<\/strong><\/p>\n\n\n\n
\uff08\u6ce8\u610f\u652f\u4ed8\u8df3\u8f6c\u5931\u8d25\u7684\u8bdd\uff0c\u8bf7\u4f7f\u7528\u6d4f\u89c8\u5668\u6253\u5f00\u672c\u9875\u9762\uff09<\/p>\n\n\n
\n\t\t\t\t\u60a8\u9700\u8981\u5148\u652f\u4ed8 39\u5143<\/b> \u624d\u80fd\u67e5\u770b\u6b64\u5904\u5185\u5bb9\uff01\u7acb\u5373\u652f\u4ed8<\/a>\n\t\t\t<\/div><\/p><\/a><\/p>\n\n\n\n
\u4e03\u3001\u5b8c\u6574\u7248\u4ee3\u7801\u91cd\u8981\u66f4\u65b0<\/h4>\n\n\n\n
20230405 \u5b8c\u6210\u521d\u7248\u4ee3\u7801<\/p>\n\n\n\n
\u516b\u3001\u5e38\u89c1\u95ee\u9898<\/h4>\n\n\n\n
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