How to remove duplicates in an array
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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]
采纳的回答
>> 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
1 个评论
Jan
2013-7-2
@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);
更多回答（2 个）
Image Analyst
2013-7-2
0 个投票
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.
Jan
2013-7-2
0 个投票
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.
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