i have a matrix A of size 523418*2, i want to delete repeating pair?? as i explained below. any help??

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M.Prasanna kumar
M.Prasanna kumar 2019-2-5
评论： Guillaume 2019-2-5
a = [ 1 2 ; 2 1 ; 2 3 ; 5 2 ]
a =
1 2
2 1
2 3
5 2
i used following two logics,but neither gives my answer
>> uniqueresult = unique(sort(a,2), 'rows');
or
uniqueresult = unique(sort(a,2), 'rows','stable');
but this gives as following
uniqueresult =
1 2
2 3
2 5
but i want as
uniqueresult =
1 2
2 3
5 2

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Guillaume
Guillaume 2019-2-5
[~, tokeep] = unique(sort(a, 2), 'rows', 'stable'); %stable optional if you don't care about the ROW ordering
result = a(tokeep, :)
  2 个评论
Guillaume
Guillaume 2019-2-5
~ means don't care about that output (the first one). We only keep about the second output, which is the index of the unique rows (the one you want to keep).

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