Searching and Manipulating Cell Array

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Sam Da 2012-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/51309-searching-and-manipulating-cell-array

采纳的回答： Matt J

I have a cell array A:

[3,2]

[2,4]

[4,5]

[2,5]

[6]

and cell array B:

[2,3,4]

[2,5]

[4,5,6]

In the array B I can see that [2,3,4] is made of union of [3,2] and [2,4] from A. [2,5] in B is made from union of only [2,5] from A. [4,5,6] in B is made of [4,5] and [6] in A.

So, I want to find the index of elements in A union of which make each array element of B. How do I do this?

Thanks guys

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Azzi Abdelmalek 2012-10-19

what are the sizes of elments in B? can they be >3. The same question about A

Sam Da 2012-10-19

Yes they can be of any length. Thanks for interest. I think Matt's code already works for a general case. But if you have a simpler solution please do post.

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Matt J 2012-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/51309-searching-and-manipulating-cell-array#answer_62551

编辑：Matt J 2012-10-19

在 MATLAB Online 中打开

subsetmap=false(length(A), length(B));
for bb=1:length(B)
    for aa=1:length(A)
      subsetmap(aa,bb) = all(ismember(A{aa},B{bb}));
     end
end
%this next line is unnecessary if logical indexing is sufficient
indices=arrayfun(@(col) find(subsetmap(:,col)),1:length(B),'uni',0);

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Matt J 2012-10-19

Yes. My code already does that.

Matt J 2012-10-19

By the way. My code doesn't check to see whether all B{i} can actually be formed from the union of some A{j}. It only works if this is already the case. I leave it to you to add the appropriate error checks.

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