ismember: how to read the results quicker?

1 次查看（过去 30 天）
wesleynotwise
wesleynotwise 2017-6-3
评论： wesleynotwise 2017-6-3
Hello. I would like to know how to return real values instead of logical values when the 'ismember' is used? eg:
A = [1 2 3 4 5];
B = [6 7 4 5 9 10 11 12];
ismember (A,B)
ans =
1×5 logical array
0 0 0 1 1
Is it possible to have this as output?
[4 5]

请先登录，再回答此问题。

采纳的回答

Stephen23
Stephen23 2017-6-3
编辑：Stephen23 2017-6-3
find(ismember(...))
Keep in mind that logical indexing is more efficient for simple indexing tasks, so the answer to the question posed in your title "ismember: how to read the results quicker?" is actually to do the opposite of what you asked: just use logical indexing, and not subscript indexing (and especially not waste time using find).

更多回答（1 个）

Steven Lord
Steven Lord 2017-6-3
Stephen's answer assumed A was of the form 1:N.
A = [5 4 3 2 1];
B = [6 7 4 5 9 10 11 12];
loc = ismember(A, B)
find(loc)
A(loc)
Use the output from ismember to index back into A to retrieve the elements of A that are in B.

类别

在 Help Center 和 File Exchange 中查找有关 MATLAB 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by