Extract indices from other matrix corresponding to the minimum

1 回表示 (過去 30 日間)
KostasK
KostasK 2022 年 2 月 7 日
編集済み: Matt J 2022 年 2 月 7 日
I currently have a matrix in which I want to determine the column which corresponds to the minimum of each row, which I can do the following way:
Mat = rand(30, 2) ;
[~, min_idx] = min(Mat, [], 2, 'linear') ;
[~, col] = ind2sub(size(Mat), min_idx) ;
Following that, I would like to use col, to extract the corresponding 3rd dimension in another matrix X:
X = rand(30, 3, 2) ;
Xmin = X(:,:,col) ;
For Xmin I would expect to get a 2D matrix, where each row corresponds to the index col in the 3rd dimention extracted from X, however that is not the case for some reason. Do you know how I could accomplish the above?
Thanks for your help in advance.

採用された回答

Matt J
Matt J 2022 年 2 月 7 日
編集済み: Matt J 2022 年 2 月 7 日
Mat = rand(30,2);
X = rand(30, 3, 2) ;
[~, min_idx] = min(Mat, [], 2, 'linear') ;
Xp=reshape( permute(X,[1,3,2]),[],3);
Xmin=Xp(min_idx,:)
Xmin = 30×3
0.0712 0.3075 0.8858 0.6488 0.0418 0.7136 0.9145 0.4471 0.9905 0.1935 0.1567 0.1708 0.1016 0.3393 0.3916 0.8534 0.8261 0.4123 0.2960 0.7503 0.8993 0.1845 0.9356 0.2080 0.7731 0.7444 0.5096 0.5429 0.7494 0.9430

その他の回答 (0 件)

カテゴリ

Help Center および File ExchangeMatrix Indexing についてさらに検索

タグ

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by