Find values in list that appear exactly once

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Johannes Korsawe
Johannes Korsawe 2017-8-25
评论： Stephen23 2021-7-17
Hi there,
assume, i have a list of integer values. I need a fast way to find those values in the list, that appear exactly once.
By now i have a code that finds the duplicate values and dismisses them.
list = randi(100,100,1); % Generate a list which should contain duplicate values
[vals,i]=sort(list);
j=find(all(diff(vals)==0,2));
ii=i([j;j+1]);
list(ii)=[];
Is there a faster way to get the final result?
Cheers, Johannes

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Stephen23
Stephen23 2017-8-25
编辑：Stephen23 2017-8-25
How about this:
[tmp,idx] = sort(list);
idp = diff(tmp)>0;
list(idx([true;idp]&[idp;true]))
If you are okay with getting the output sorted then it can be simplified further:
tmp = sort(list);
idp = diff(tmp)>0;
tmp([true;idp]&[idp;true])

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