How to remove rows having repeating elements from a matrix?

Question

Susmita 2016-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/280806-how-to-remove-rows-having-repeating-elements-from-a-matrix

评论： David Wagener 2019-12-1

If I have a matrix A=[ 1 2 1 4; 1 2 3 4; 3 2 1 4; 3 3 2 1] then I want a matrix as B=[ 1 2 3 4; 3 2 1 4] so that both the 1st and 4th row will be deleted as they have repeated elements. pls help me to find out the code.

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Answer 1

Roger Stafford 2016-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/280806-how-to-remove-rows-having-repeating-elements-from-a-matrix#answer_219299

编辑：Roger Stafford 2016-4-27

在 MATLAB Online 中打开

   t = false(1,size(A,1));
   for k = 1:size(A,1)
     u = unique(A(k,:));
     t(k) = size(u,2)==size(A,2);
   end
   B = A(t,:);  % Rows with repeated elements deleted

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Susmita 2016-4-27

Thanks for d answer...It's running correctly..

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Answer 2

Baltam 2016-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/280806-how-to-remove-rows-having-repeating-elements-from-a-matrix#answer_219300

在 MATLAB Online 中打开

The below method is not elegant but it works.

   A=[ 1 2 1 4; 1 2 3 4; 3 2 1 4; 3 3 2 1];
   index = zeros(1,size(A,1));
   for i = 1:size(A,1)
       if numel(unique(A(i,:))) ==  numel(A(i,:))
          index(i)=1;
       end
   end
   index = logical(index);
   B = A(index,:);

Kind regards,

Baltam

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Susmita 2016-4-27

This code is also running correctly..thanks@Baltam

David Wagener 2019-12-1

The second version shown here while not as elegant works better if you have a large matrix and are using parallel processing. I'm not an expert by any means but the second version did not overload my machine like the first one did.

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