作者查詢 / ht15trep
作者 ht15trep 在 PTT [ MATLAB ] 看板的留言(推文), 共211則
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4F→:ex(ex==0)=[]10/27 15:27
1F→:squareform()10/14 00:37
2F→:不過這對角會變0, 而且你的資料必須是逐對的型式10/14 00:42
1F→:以princomp去解特徵向量就是用svd了,用 edit princomp 看10/07 21:27
2F→:另外就是解釋變異的總合應與變數總數相同10/09 14:05
3F→:所以實際的EV1和EV2要乘以總變數量5才是正確的值10/09 14:06
4F→:(變數數量:5,觀測次數:10)10/09 14:06
8F推:loading正負顛倒沒差10/05 13:27
2F→:PCA和SVD都能找主成分,但是PCA是解COV或CORR矩陣10/05 13:28
3F→:應該說用eig去解才是解COV或CORR矩陣,用SVD則是解原矩陣10/05 13:30
4F推:解cov或corr時會自動移除每個變數的平均,svd則否10/05 13:33
1F推:p = anova1(X) → p = anova1(X,[],'off')08/28 21:23
3F推:mvregress08/28 21:20
3F→:for i=1:10,A(:,:,i)=(其中一個矩陣);end07/13 14:52
4F→:然後 std(A,0,3)07/13 14:57
2F→:把 0 改成 NaN, 或是調整顯示範圍07/12 17:44
1F推:kmeans分為第1類的點取出來並畫紅色點06/06 22:32
2F→:== 就是幫你從頭比較到尾了06/06 22:33