how to compare a single row with remaining all rows of a matrix?

Question

Sivakumaran Chandrasekaran 2012-9-3

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评论： Jacek 2015-10-25

my input matrix is v=[1 2 3 4 5;3 4 7 8 9;6 4 8 7 9;3 4 7 8 9;3 2 9 8 4]; I am taking second row alone. I have to compare it with all the remaining rows. How to do it. Suggest me simple code which has few lines.

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Azzi Abdelmalek 2012-9-3

wha should be you result? a matrix?

Jan 2012-9-3

What have you tried so far? Which problems occurred? What does "compare" exactly mean?

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Answer 1

Andrei Bobrov 2012-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/47273-how-to-compare-a-single-row-with-remaining-all-rows-of-a-matrix#answer_57741

编辑：Andrei Bobrov 2012-9-3

在 MATLAB Online 中打开

out = ismember(v,v(2,:),'rows');

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Sivakumaran Chandrasekaran 2012-9-5

Your reply matches my requirement exactly. Thanks Andrei bobrov.. And I thank all the people who spend their time to answer my query.

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Answer 2

Azzi Abdelmalek 2012-9-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/47273-how-to-compare-a-single-row-with-remaining-all-rows-of-a-matrix#answer_57742

编辑：Azzi Abdelmalek 2012-9-3

在 MATLAB Online 中打开

v=[1 2 3 4 5;3 4 7 8 9;6 4 8 7 9;3 4 7 8 9;3 2 9 8 4]
v2=v(2,:);
comp=any(bsxfun(@minus,v,v2),2))

%the result:

comp=1 0 1 0 1

that means that fourth row (comp(4)=0) is equal to the second row

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Jacek 2015-10-25

For the future generations: I tested both solutions and solution proposed by Azzi is much faster, exactly 9x faster in my application, what was very important for me (large-scale data structures reorganization).

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