How do you remove duplicates without using unique?

Question

jeff417 2016-4-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/278144-how-do-you-remove-duplicates-without-using-unique

评论： Star Strider 2016-4-9

I have a problem where I have to remove duplicates from a column without using unique and without sorting the data. My current code is able to remove duplicates without unique, but the data has to be sorted for it to work. Is there a way to remove the duplicates without sorting and without using unique?

z = length(A);
for i = 1:(z-1)
    if A(i+1) == A(i)
        A(i) = A(i) - A(i+1);
    end
end
A(A==0) = [ ];        
end

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Answer 1

Star Strider 2016-4-9

2
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https://ww2.mathworks.cn/matlabcentral/answers/278144-how-do-you-remove-duplicates-without-using-unique#answer_217180

在 MATLAB Online 中打开

One approach:

A = [1;2;3;3;4;5;6;7;7;8;9];
Ac = zeros(size(A));
for k1 = 1:length(A)-1
    Ac(k1) = sum(A(k1) == A(k1+1:end));
end
Out = A(Ac == 0)
Out =
       1
       2
       3
       4
       5
       6
       7
       8
       9