How to find unique pages in a 3d matrix?

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may
may 2013-2-12
If I have 3d matrix like
A = cat(3, [1 2; 3 4], [5 6; 3 4], [5 6; 1 2],[1 2; 3 4])
I want to find unique pages in this matrix so the result should be
result = cat(3, [1 2; 3 4], [5 6; 3 4], [5 6; 1 2])

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Azzi Abdelmalek
Azzi Abdelmalek 2013-2-12
编辑：Azzi Abdelmalek 2013-2-12
A = cat(3, [1 2; 3 4;0 0], [5 6; 3 4; 0 0], [5 6; 1 2;0 0],[1 2; 3 4;0 0])
[n,m,p]=size(A)
a=reshape(A,n,[],1)
b=reshape(a(:),n*m,[])'
c=unique(b,'rows','stable')'
reshape(c,n,m,[])

更多回答（1 个）

Honglei Chen
Honglei Chen 2013-2-12
You can try to reshape it to 2D first, then remove duplicates. For example
A = cat(3, [1 2; 3 4], [5 6; 3 4], [5 6; 1 2],[1 2; 3 4])
Ar = reshape(A,[4 4])
Ar = unique(Ar.','rows','stable').'
reshape(Ar,2,2,[])
I don't quite understand your second question. I think MATLAB automatically removes empty pages. What do you mean by "empty pages"?
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may
may 2013-2-12
when I use unique(Ar,'rows','stable')
I get this error! ??? Error using ==> unique at 34 Unrecognized option.
Honglei Chen
Honglei Chen 2013-2-12
Your version does not support 'stable' option, try the following
A = cat(3, [1 2; 3 4], [5 6; 3 4], [5 6; 1 2],[1 2; 3 4])
Ar = reshape(A,[4 4])
[dummy,idx] = unique(Ar.','rows')
reshape(Ar(:,sort(idx)),2,2,[])

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