Remove duplicate rows based on subset of row elements

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Federico Maglione 2019-3-5

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评论： Vijay 2020-9-30

Hello everyone,

I tried to find a similar problem - relatively simple I believe - but I could not find a solution. If, for instrance, I have a matrix such as

A = [1 1 1 100; 2 2 2 200; 3 3 3 300; 1 1 1 500]

how can I remove from A the fourth row based on the fact that only the thee first elements of the that row are identical to the three elmenets in the first row?

Also, what if I have

A = [1 1 1 100; 2 2 2 200; 3 3 3 300; 1 1 1 500; 1 1 1 600]

and, again, I just want to keep the first row?

Thank you for your help.

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madhan ravi 2019-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/448432-remove-duplicate-rows-based-on-subset-of-row-elements#answer_363965

编辑：madhan ravi 2019-3-5

在 MATLAB Online 中打开

A(unique(A(1:3),'rows'),:)

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Federico Maglione 2019-3-5

Thank you! It works perfectly

Vijay 2020-9-30

Simple, but an excellent solution.

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MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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