How to get a complement of a cell array in matlab?

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HAT 2021-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1609470-how-to-get-a-complement-of-a-cell-array-in-matlab

评论： HAT 2021-12-13

I would like to write a matlab code to get a cell array W so that W is "V without the union of three different arrays V1, V2 and V3", i.e., W = V ∖ V1∪V2∪V3 , where V= {[1,2], [3,5], [5,6], [2,4],[3,7], [3,9], [8,9] }, V1 = {[1,2], [3,5], [5,6]}, V2 = {[2,4],[3,7] }, and V3= {[3,9] }.

I have tried the following, but it yields only number W=8. But I wanted to get W = { [8,9]}.

Please any hint/assistance? Thanks in advance!

V= {[1,2],  [3,5], [5,6], [2,4],[3,7], [3,9], [8,9] };
V1 = {[1,2],  [3,5], [5,6]};
V2 = {[2,4],[3,7] };
V3= {[3,9] };
W = setdiff(cell2mat(V(:)), union(union(cell2mat(V1(:)),cell2mat(V2(:)),'rows'),cell2mat(V3(:)),'rows'))
W = 8

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Answer 1

Adam Danz 2021-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/1609470-how-to-get-a-complement-of-a-cell-array-in-matlab#answer_853615

编辑：Adam Danz 2021-12-12

在 MATLAB Online 中打开

This solution works if all elements of the 1D cell arrays 1x2 row vectors.

V = {[1,2], [3,5], [5,6], [2,4],[3,7], [3,9], [8,9] };
V1 = {[1,2], [3,5], [5,6]};
V2 = {[2,4],[3,7]};
V3= {[3,9]};
% Combine all cell arrays into an mx2 matrix
VAll = cell2mat(horzcat(V,V1,V2,V3)')
VAll = 13×2
     1     2
     3     5
     5     6
     2     4
     3     7
     3     9
     8     9
     1     2
     3     5
     5     6
% Determine which rows of matrix are unique
[~, ~, groupID] = unique(VAll,'rows','stable');
isUnq = histcounts(groupID,'BinMethod','integer') == 1;
% Return unique rows
w = VAll(isUnq,:)
w = 1×2
     8     9