MATLAB Answers

Antje
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Delete double cell array entries

Asked by Antje
on 20 Mar 2013
How can I delete double entries in a cell array? I don't want to use a loop. For example I have:
CellArray={[1 2 3] [1 2] [3 5 6 7] [1 2] [2 4] }
And as a result I want to get this:
NewCellArray={[1 2 3] [1 2] [3 5 6 7] [2 4] }
Thank you very much and have a nice day!

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3 Answers

Answer by Azzi Abdelmalek
on 20 Mar 2013
Edited by Azzi Abdelmalek
on 20 Mar 2013
 Accepted Answer

CellArray={[1 2 3] [1 2] [3 5 6 7] [1 2] [2 4] };
m=max(cellfun(@numel,CellArray));
v=cellfun(@(x) [x inf(1,m-numel(x))],CellArray,'un',0);
[~,ii]=unique(cell2mat(v'),'rows');
CellArray=CellArray(ii)

  1 Comment

Antje
on 21 Mar 2013
This solution works really fine and fast! Time needed for my loop: 1.24 seconds Time needed with the one line solution from Friedrich below: 0.3 seconds Time needed with your solution: 0.07 seconds! :) Thanks so much!

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Answer by Friedrich
on 20 Mar 2013

Hi,
one line:
NewCellArray = cellfun(@str2num, unique(cellfun(@num2str, CellArray,'UniformOutput',false)),'UniformOutput',false)

  1 Comment

Antje
on 21 Mar 2013
This solution works very good and I like that it is only one line. But in my case I prefer the faster solution from above. Thank you!

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Answer by Babak
on 20 Mar 2013

CellArray={[1 2 3] [1 2] [3 5 6 7] [1 2] [2 4] };
NewCellArray = [CellArray(1:3) CellArray(5)];

  2 Comments

CellArray is just an example, I guess his array is much bigger.
Antje
on 21 Mar 2013
Yes, that's the problem. My cell array can have thousands of entries.

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