How to find same elements in a cell array?
30 views (last 30 days)
Show older comments
Alessandro Cristini
on 14 Jul 2015
Edited: Alessandro Cristini
on 14 Jul 2015
Hello all,
I have the following question:
I need to find the same elements and how many times they are repeated in a cell array. The elements are vectors of integers (e.g, [1,3,4,5]). Then, I'd like to find the repeated sequences and the count of their repetitions.
For example, suppose that the cell array (C) is composed as follows:
[1,2,4,5] [1,4,2,5] [1,2,4,5] [4,1,5,2] [1,2,4,5] [1,4,2,5]
Is there any smart solution to get the sequences [1,2,4,5] and [1,4,2,5], and their repetitions (3 and 2, respectively)?
Thanks in advance,
Ale
2 Comments
Azzi Abdelmalek
on 14 Jul 2015
You mean [1,2,4,5] and [1,4,2,5], and their repetitions (3 and 2, respectively)
Accepted Answer
Azzi Abdelmalek
on 14 Jul 2015
Edited: Azzi Abdelmalek
on 14 Jul 2015
a={[1,2,4,5] [1,4,2,5] [1,2,4,5] [4,1,5,2] [1,2,4,5] [1,4,2,5]}
b=cell2mat(a')
[ii,jj,kk]=unique(b,'rows')
out=[ii accumarray(kk,1)]
The last column of out is the frequency
1 Comment
More Answers (1)
Andrei Bobrov
on 14 Jul 2015
Edited: Andrei Bobrov
on 14 Jul 2015
a = {[1,2,4,5] [1,4,2,5] [1,2,4,5] [4,1,5,2,1] [1,2,4,5] [1,4, 2,5]};
a = a(:);
[a1,b,c] = unique(cellfun(@char,a,'un',0));
lo = histc(c,1:max(c));
loo = lo(:) > 1;
out = [a(b(loo)), num2cell(lo(loo))];
1 Comment
See Also
Categories
Find more on Data Type Identification in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!