Clear Filters
Clear Filters

how to find the row index of specific vector in a matrix

142 views (last 30 days)
Hi everyone, suppose there's a marix [2 0;-2 1;2 3], I want find the row index of [-2 1], i.e., [-2 1] is on the second row of [2 0;-2 1;2 3]. how to realize it in matlab? Many thanks!

Accepted Answer

Star Strider
Star Strider on 7 Apr 2019
Try this:
A = [2 0;-2 1;2 3];
RowIdx = find(ismember(A, [-2 1],'rows'))
producing:
RowIdx =
2
  2 Comments
Elizabeth Thompson
Elizabeth Thompson on 11 Mar 2022
How would I do this if the vector I am looking for is a subset of A? i.e. If A is a matrix with three columns, and I want to find which row a 1x2 array x is in of A? idx=find(ismember(A,x,'rows')) obviously wouldn't work here, but is there a way to do this still using the find(ismember()) command?

Sign in to comment.

More Answers (0)

Categories

Find more on Characters and Strings in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!