Arrange a matrix with repeated rows

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Kyle
Kyle 2012-12-2
Hi,experts
I have a raw matrix as:
a = [125 97
126 104
97 125
104 126];
I'm looking for an algorithm to manipulate this matrix with an output as:
a = [125 97
97 125
126 104
104 126];
just I want to put repeated row together. This is a small piece of a large matrix, but the structure is the same.
Thank you Kyle

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采纳的回答

José-Luis
José-Luis 2012-12-2
[idx idx] = sortrows(sort(a,2));
a = a(idx,:);

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-12-2
编辑：Azzi Abdelmalek 2012-12-2
a = [125 97;126 104;97 125;5 4;104 126;97 125;4 5];
b=cell2mat(arrayfun(@(x) sort(a(x,:)),1:size(a,1),'un',0)')
[~,idx]=sortrows(b)
out=a(idx,:)
%If you don't need it to be sorted
b=cell2mat(arrayfun(@(x) sort(a(x,:)),1:size(a,1),'un',0)')
[c,d,e]=unique(b,'rows','stable')
[~,idx]=sort(e);
out=a(idx,:)

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