How to exclude rows on the basis of specific entries?
36 ビュー (過去 30 日間)
古いコメントを表示
採用された回答
Guillaume
2018 年 2 月 6 日
It's not clear what you mean by repeat.
If you mean you want to delete rows whose first four columns contain more than one 4:
A = [4 4 1 2; 4 4 4 4;1 4 2 4;4 2 3 2]
todelete = sum(A(:, 1:4) == 4, 2) > 1;
A(todelete, :) = []
If you mean you want to delete rows whose first four columns contain two more more consecutive 4, then it's a lot more complicated. One possible way
A = [4 4 1 2; 4 4 4 4;1 4 2 4;4 2 3 2]
todelete = cellfun(@(row) ~isempty(strfind(row, [1 1])), num2cell(A(:, 1:4) == 4, 2));
A(todelete, :) = []
9 件のコメント
その他の回答 (1 件)
Jos (10584)
2018 年 2 月 6 日
Here is a flexible example:
% data
X = [4 4] ; % rows starting with this should be discarded
A = [1 4 1 4 ; 4 4 2 2 ; 4 2 4 0 ; 4 4 4 4 ; 2 4 4 2] ; % rows 2 and 4 should be discarded
% engine
tf = ismember(A(:,1:numel(X)), X, 'rows')
A(tf) = [] ; % remove
0 件のコメント
参考
カテゴリ
Help Center および File Exchange で Creating and Concatenating Matrices 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!