Subtracting 2 matrices of different dimensions

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RDG
RDG 2013-8-29
a{1}=[1 3 4 5;
3 3 4 5;
5 5 4 5
2 4 2 6;
6 5 2 6
7 2 3 1;]
[b,idx]=unique(a{1}(:,3:4),'rows','stable');
uniquematrix{1}=a{1}(idx,:)
1 3 4 5 %Content of uniquematrix{1}
2 4 2 6
7 2 3 1
After a{1}-uniquematrix{1}
3 3 4 5 %My desired output
5 5 4 5
6 5 2 6
Is there a function to directly perform a{1}-uniquematrix{1}?

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-29
a=[1 3 4 5;
3 3 4 5;
5 5 4 5
2 4 2 6
6 5 2 6
7 2 3 1]
[b,idx]=unique(a(:,3:4),'rows','stable')
out=a(setdiff(1:size(a,1),idx),:)

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-29
a=[1 3 4 5;
3 3 4 5;
5 5 4 5
2 4 2 6
6 5 2 6
7 2 3 1]
[b,idx]=unique(a(:,3:4),'rows','stable')
uniquematrix=a(idx,:)
n1=size(a,1)
n2=size(uniquematrix,1)
uniquematrix=[uniquematrix;zeros(n1-n2,size(a,2))]
out=a-uniquematrix

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