How to find unique group of numbers?

Question

Leon 2020-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/585506-how-to-find-unique-group-of-numbers

评论： Leon 2020-8-27

I have a cell array like the below, storing some groups of numbers:

C{1} = [1; 3; 4];
C{2} = [3; 9; 135; 278];
C{3} = [6; 89; 256; 803; 6987; 2356];
C{4} = [356; 799; 2567; 5680];
C{5} = [4; 1; 3];
...

There are some duplicates. For example, C{1} and C{5} are duplicates. How do I remove the duplicates from this array?

Many thanks!

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Adam Danz 2020-8-27

在 MATLAB Online 中打开

There are lots of ways to do this.

C{1} = [1; 3; 4];
C{2} = [3; 9; 135; 278];
C{3} = [6; 89; 256; 803; 6987; 2356];
C{4} = [356; 799; 2567; 5680];
C{5} = [4; 1; 3];
C{6} = [356; 799; 2567; 5680];
Cs = cellfun(@(v){sort(v)}, C);
[a,b] = meshgrid(1:numel(C),1:numel(C));
pairs = unique(sort([a(:),b(:)],2), 'rows'); 
pairs(pairs(:,1)==pairs(:,2),:) = [];
isDuplicate = arrayfun(@(i,j)isequal(Cs{i},Cs{j}),pairs(:,1),pairs(:,2)); 
C(pairs(isDuplicate,2)) = []; 

Leon 2020-8-27

Works as well. Many thanks, Adam!

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Answer 1

Bruno Luong 2020-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/585506-how-to-find-unique-group-of-numbers#answer_486044

在 MATLAB Online 中打开

I propose do it this way:

% Test example
C{1} = [1; 3; 4];
C{2} = [3; 9; 135; 278];
C{3} = [6; 89; 256; 803; 6987; 2356];
C{4} = [356; 799; 2567; 5680];
C{5} = [4; 1; 3];
s1 = cellfun('size',C,1);
m = max(s1);
d = cellfun(@(a) [length(a), sort(a).', inf(1,m-length(a))], C, 'unif', 0); % First row is the length, Pad the tail with inf
[~,i] = unique(cell2mat(d(:)),'stable','rows');
C = C(i); % Here is the final cells to be kept  
% Display
C{:}