Get supersets from cell array of doubles

Question

Hau Kit Yong 2021-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/722415-get-supersets-from-cell-array-of-doubles

编辑： dpb 2021-1-21

I have a cell array of doubles, e.g.

C{1} = [1,2,3,4];
C{2} = [3,4,5,6,7,8];
C{3} = [2,3];
C{4} = [7,8,9,10];
C{5} = [1,2,6,7,8,9,10];

I want to find the indexes of arrays that are not fully contained within another array, so in this case, the code should return

[1,1,0,0,1]

I reckon some use of ismember is needed but I can't quite make out how.

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dpb 2021-1-21

编辑：dpb 2021-1-21

I think you can only do that by testing each set with the combination of all other sets together.

ADDENDUM:

On thinking about it, I believe I'd be tempted to put the whole mess into a 2D array with the data in one column and the cell number in the second. Then a grouping variable could be used to operate by what is now cell.

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Answer 1

dpb 2021-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/722415-get-supersets-from-cell-array-of-doubles#answer_603143

编辑：dpb 2021-1-21

在 MATLAB Online 中打开

I misread the problem statement originally and the second idea didn't really help all that much. It's fairly straightforward, though...

res=false(numel(C));
for i=1:numel(C)
  isOK=false;
  for j=setdiff(1:numel(C),i)
    isOK=isOK|all(ismember(C{i},C{j}));
  end
  res(i)=~isOK;
end

For the sample array above produces

>> res
res =
  1×5 logical array
   0   0   1   1   0
>> res=~res
res =
  1×5 logical array
   1   1   0   0   1
>> 

before incorporating the not operator inside the loop over i ...did it that way to debug more easily. One could change the sense of the return from all at that point instead; your call.