Find unique in matrix of x,y coordinates

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Ruchi Bhatia
Ruchi Bhatia 2017-12-19
评论： Ruchi Bhatia 2017-12-20
Hello, I would love your help.
If I have a matrix of x,y coordinates for example:
x y
A=[ 2.5 3.5
1.2 3.5
2.2 1.2
1.2 3.5
4.0 2.2 ]
How do I find a unique of this? In the above example one instance of x,y (1.2, 3.5) will be removed?

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采纳的回答

Kelly Kearney
Kelly Kearney 2017-12-19
To find unique rows, you can use unique with the 'rows' option. (The 'stable' option preserves the input order, if that's important for your application).
unique(A, 'rows', 'stable')

更多回答（2 个）

Image Analyst
Image Analyst 2017-12-19
Try unique() with the 'rows' option:
uniqueRowsOfA = unique(A, 'rows')
Kaushik Lakshminarasimhan
Did you try this?
[C,IA] = unique(A,'rows');
C contains all unique rows of A. IA contains the indices of the rows of A that are in C. So if you want the indices of the rows that were removed, you can use:
[nrows,~] = size(A);
notIA = setdiff(1:nrows,IA); % duplicate rows

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