How to remove duplicates in an array

Question

MKN 2013-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/80862-how-to-remove-duplicates-in-an-array

Ex: In the array x=[1 2 2 3 3 3 4 5], i want to eliminate all repeating elements (2,3) and retain non-repeating elements (1,4,5)
i.e., If x=[1 2 2 3 3 3 4 5], answer should be x=[1 4 5]

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Answer 1

Octa 2013-7-2

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编辑：Octa 2013-7-2

在 MATLAB Online 中打开

 >> x=[1 2 2 3 3 3 4 5];
 >> y = zeros(size(x));
 >> for i = 1:length(x)
   y(i) = sum(x==x(i));
end
 >> for i=length(y):-1:1
 if(y(i)>=2)
 x(i)=[];
 end
 end
 And your output will be 
 >>x
   1     4     5

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Jan 2013-7-2

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@Octa: Please do not post solutions of homework questions. Reducing the size of an array iteratively has a bad performance. An efficient and more matlabish approach for the 2nd loop:

x = x(x >= 2);

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Answer 2

Image Analyst 2013-7-2

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Sounds like homework. As hints, I'd probably use max() to find the greatest integer and the histogram edges, histc() to get the counts, and ismember() to help with removal. It's just a few lines of code - see if you can do it.

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Answer 3

Jan 2013-7-2

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You can also SORT the values at first and obtain the sorting index as 2nd output. Then use DIFF to find equal elements. Finally you can remove them and restore the original order by using the sorting index.