how to get common elements within a cell array?

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Tha saliem 2018-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/386454-how-to-get-common-elements-within-a-cell-array

评论： Tha saliem 2018-3-6

采纳的回答： the cyclist

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hey all

If i have following array:

{[1,7];[2,6,1];[7,1,3];[3,5]}

how can I compare each cell in this array with all other cells'values. for example for first cell [1,7] i have to compare it with all other cells and find common values. to compare with [2,6,1] we will get 1, to compare with [7,1,3] we will get [1,7] and with [3,5] we will get an empty cell. Similarly after this we will compare 2nd cell [2,6,1] with all cells in array.

please help

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Jan 2018-3-5

编辑：Jan 2018-3-5

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Do the single vectors have unique elements? In other words: Is this possible as input or not:

{[1,7]; [2,6,1,1,6]}

Tha saliem 2018-3-6

Yes they have unique elements.. [2,6,1,1,6] is not possible

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Answer 1

the cyclist 2018-3-6

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Do you need the comparison result? If not, I think this skips right to the final result

aL =  1:length(a);
for na = aL
  finalResult{na} = intersect([a{na}],[a{setdiff(aL,na)}]);
end

This code is a bit obfuscated. But if it gives the result you expect, I can try to help you understand it if you need me to.

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the cyclist 2018-3-6

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Here is the de-obfuscated version of my code, commenting on what each piece does.

% The data
a = {[1,7];[2,6,1];[7,1,3];[3,5]};
% Vector from 1 to the length of a
aL =  1:length(a);
% Loop through the vector
for na = aL
      % Get the elements from the current cell
      elementsFromCurrentCell = [a{na}];
      % Create index to all *other* cells, except for the current cell
      indexToOtherCells = setdiff(aL,na);
      % Concatenate all the elements from those other cells
      elementsFromAllOtherCells = [a{indexToOtherCells}];
      % Find the intersection between the current cell and all the other cells
      finalResult{na} = intersect(elementsFromCurrentCell,elementsFromAllOtherCells);
end

In order to get the "comparison" results, you just need to loop over each other cell in turn, rather than concatenating them all together the way I did to get the final result.

Tha saliem 2018-3-6