Delete rows with the same data in the matrix
显示 更早的评论
Let's say I have a matrix, and I want to get rid of the duplicates and keep them once, so I can use unique, but I want to get rid of the rows that have the same data but are in different positions and keep them once, so what do I do?
The starting matrix = [1 1;1 2;2 3;4 5;1 1;2 1;3 2];
I want the result = [1 1;1 2;2 3;4 5]; or [1 1;2 1;3 2;4 5];
Can anyone help me with this as I'm completely new with MATLAB. I would be grateful.
采纳的回答
x = [1 1;2 1;2 3;4 5;1 1;1 2;3 2]; % Swapped [1,2] and [2,1]
sx = sort(x, 2); % Sort the rows:
[ux, ix] = unique(sx, 'rows', 'stable');
% Solution 1: sorted order
ux
% Solution 2: original order
x(ix, :)
6 个评论
Rik
2022-11-8
@Chenglin Li Flags are meant to attract attention from site admins.
I see this answer has already received an upvote. If you want to express your gratitude beyond that, you should post a comment instead of a flag.
Chenglin Li
2022-11-8
Bruno Luong
2022-11-8
Jan's answer is clearly better than the accepted answer
Chenglin Li
2022-11-8
Jan
2022-11-8
Unfortunately the formerly accepted answer was deleted. Its runtime grows quadratically with the size of the input. Although the code I've suggested is faster, it was valuable to see the different approaches to learn for own implementations.
Chenglin Li
2022-11-8
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