How to select the combinations without repetitions in a matrix?

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Adam Silva
Adam Silva 2014-2-1
评论： Azzi Abdelmalek 2014-2-1
Hi Everybody,
I have a question regarding matrix sorting. I have a matrix "A" a 6 by 2 matrix.
A=[
1 2
3 2
1 2
2 1
1 4
2 5];
As you can see row 1,3 and 4 have the same answer but inter changed numbers. How do we get matrix "B" without any combination repeats. Thank you
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Image Analyst
Image Analyst 2014-2-1
Azzi's code should do it then, since you want to take the first occurrence , regardless of the order of the columns. WARNING: If you have floating point numbers and not integers, be aware of the FAQ: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
Adam Silva
Adam Silva 2014-2-1
Hi, I only have integers. But Azzi'z code gave me an error,
??? Error using ==> unique at 33 Unrecognized option.
Error in ==> nodesort at 209 [ii,jj]=unique(sort(A,2),'rows','stable')

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-1
编辑：Azzi Abdelmalek 2014-2-1
[ii,jj]=unique(sort(A,2),'rows','stable')
B=A(jj,:)
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