How to eliminate duplicate rows without sorting column in Matlab

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Nejc 2013-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/69858-how-to-eliminate-duplicate-rows-without-sorting-column-in-matlab

Hi,

Here is one problem that maybe some people will find useful to them.

I got matrix, lets say 500x9. In this matrix some rows are identical so they have to be eliminated. But the 3rd column musn't be sorted. This must be unchanged. All other columns can be changed (sorted).

I tryed this with function unique, but it sort me 3rd column.

Thank you in advance.

Have a nice day,

Nejc

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回答（1 个）

Azzi Abdelmalek 2013-4-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/69858-how-to-eliminate-duplicate-rows-without-sorting-column-in-matlab#answer_80990

在 MATLAB Online 中打开

unique(A,'stable')

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Sean de Wolski 2013-4-4

@Nejc, the 'stable' option became available in R2012a.

Azzi Abdelmalek 2013-4-4

在 MATLAB Online 中打开

Edit

A=[1 2;3 5;1 2;0 2;0 2]
[~,idx]=unique(A,'rows','first')
out=A(sort(idx),:)

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MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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