Remove close value for matrix

Question

Laura 2013-7-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81793-remove-close-value-for-matrix

采纳的回答： Azzi Abdelmalek

I have a matrix A with has dimension n x3

I want to remove the data values that are so close to certain value or repeated.

Let say A = [ 1 1 1; 1 1 1.5; 1.1 1.2 1 , so on ]

definitely they are closed and I cant use "unique" command because they are not repeated for all 3 values.

How to remove those value in certain distance: let say if the distance is less than or equal to .5, then remove that row. We can average those value that would be awesome all close value and replace it in the new matrix.

Note: A has unknown row, so it has to be a loop.

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Answer 1

Azzi Abdelmalek 2013-7-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81793-remove-close-value-for-matrix#answer_91502

编辑：Azzi Abdelmalek 2013-7-11

在 MATLAB Online 中打开

A = [ 1 1 1; 1 1 1.5; 1.1 1.2 1 ;2 3 4;2.1 2.9 4.5]
tol=0.5*ones(1,size(A,2));
v=(1:size(A,1));
idx=arrayfun(@(x) all(bsxfun(@le,abs(bsxfun(@minus,A,A(x,:))),tol),2),v,'un',0);
idx=cell2mat(idx);
for k=1:size(idx,1)
  q=idx(:,k);
  A(q,:)=repmat(mean(A(q,:)),sum(q),1);
end
out=unique(A,'rows')