Extract two closest rows of a matrix

Question

amir 2016-3-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/274533-extract-two-closest-rows-of-a-matrix

评论： amir 2016-3-21

采纳的回答： dpb

Hello,

How can I extract two closest rows of a matrix and set one of them to zero?

thank you.

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Image Analyst 2016-3-20

在 MATLAB Online 中打开

Well, here is the "set to zero" part

yourMatrix(closestRow, :) = 0;

to determine what scalar value you need for closestRow, you need to answer dpb's question.

amir 2016-3-20

在 MATLAB Online 中打开

I have two different matrixes of [x y width height] which the size of each matrix might vary in size over the time. I have merged them together and got one matrix as the result. Now I am planning to check for the two closest [x y] coordinates within this matrix and eliminate one.

In the following example, the first two rows of result matrix are closest to each other in [x y]. Then, either first row or second row need to be removed/or set to zero.

Matrix A = 
385  208  108  108
matrix B = 
398  223  96  96
113  225  114  114
Result Matrix= 
385  208  108  108
398  223  96  96
113  225  114  114

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Answer 1

dpb 2016-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/274533-extract-two-closest-rows-of-a-matrix#answer_214447

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d=pdist(M(:,2));          % find the pairwise differences
ix=find(min(d(1:end-1));  % shortest distance excluding wraparound of 3-1
M(ix,:)=[];               % remove that row