selecting indices in a matrix and setting the rest to zero
24 次查看(过去 30 天)
显示 更早的评论
Hi,
I have a 414x22 matrix A and an array of indices
idx=[99 93 149 150 152 96 97 139 94 135 137 136 138 305 299 329 330 258 302 303 319 300 315 317 316 318]'
I would like to have all values in the matrix other than those in the rows of the indices (across columns) set to zero but I'm stuck on the code. It should be something like
new_idx=ismember(1:numel(A),idx)
A(~new_idx)=0
However that obviously treats the matrix as an array so only the first column had the numbers...
0 个评论
采纳的回答
Torsten
2023-3-14
A = rand(5,3);
idx = [2 4].';
idx_left = setdiff(1:size(A,1),idx)
A(idx_left,:) = zeros(numel(idx_left),size(A,2))
更多回答(1 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!