Find the Argmin of a vector
11 ビュー (過去 30 日間)
古いコメントを表示
Help:
Let x be a vector and B_1...B_p p matrices,
I look for the index j* of the matrix such that
||B_j*||=min ||B_i x||, (||.||=norm)
How do I write this with matlab?
5 件のコメント
Walter Roberson
2020 年 8 月 8 日
You have variables named B_ followed by a number, and you want to process the whole series of variables. That is bad programming practice. You should have avoided naming the variables that way, and should have used (for example) a cell array.
Are you trying to find which of the B_ arrays leads to the smallest norm given a vector x? If so then if you had the arrays represented as a cell array, that would only be a small number of statements.
採用された回答
Matt J
2020 年 8 月 8 日
編集済み: Matt J
2020 年 8 月 9 日
You should have avoided naming the variables that way, and should have used (for example) a cell array.
Indeed. Here's an example of how to do it when that is the case.
Bcell={rand(5), rand(5), rand(5), rand(5)}; %B1,...,Bp p=4
[~, jstar] = min(cellfun(@(B) norm(B*x),Bcell)) %EDITED
5 件のコメント
Matt J
2020 年 8 月 10 日
You're very welcome, but please Accept-click the answer if you got it working.
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Logical についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!