Remove consecutive duplicates from matrix
22 views (last 30 days)
Show older comments
Hello,
i need to remove duplicates form my matrix, but only if they are consecutive duplicates.
Lets suppose i have the following list of coordinates in a matrix, with for example x, y and z coordinates, that is describing a path.
A=[ 1, 0, 3
2, 1, 3
2, 1, 3
2, 2, 3
1, 0, 3]
Now, you can see that the point [2, 1, 3] is a consecutive duplicate, that I want to remove (because it's unuseful information).
But I do not want to remove the (duplicate) row at the end, [1, 0, 3], even if this row is already there in the beginning.
Also, the sorting shouldn't be changed. The desired output should be
A=[ 1, 0, 3
2, 1, 3
2, 2, 3
1, 0, 3]
I cannot use 'unique' for that, because that would filter also the last line.
What is the smartest way to do that?
Thank you very much for your help!
0 Comments
Accepted Answer
Ameer Hamza
on 26 Nov 2020
Try this
A=[ 1, 0, 3
2, 1, 3
2, 1, 3
2, 2, 3
1, 0, 3];
idx = find(~any(diff(A), 2))+1;
A(idx, :) = [];
4 Comments
More Answers (0)
See Also
Categories
Find more on Elementary Math 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!