Find repeated values in an array, by column and rows (unique function).

Question

Yro 2021-5-19

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回答： Matt J 2021-5-24

Hi, I want to find the repeated vectors in an array where I have n columns and m rows. For example in the following array:

ARRAY = [
04828	8.80036 ...
04828	8.80036 ...
11259	8.74653 ...
04828	8.80036 ...
24358	8.74653 ...
9823	9.05449 ...
02563	8.24793 ...
5415	8.94942 ...
28989	8.81836 ...
...
]

I want to find the repeated vectors (x1, x2), which are repeated in rows 1, 2 and 4. Using the unique function, I can get the repeated value by defining:

[C1, ia1, ic1] = unique(A(:,1),'stable', 'rows');

but only by columns. How can I get the vector that repeats?

Thanks in advance.

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Answer 1

KSSV 2021-5-19

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A = [9.04828	8.80036 ;
04828	8.80036 ;
11259	8.74653 ;
04828	8.80036 ;
24358	8.74653 ;
9823	9.05449 ;
02563	8.24793 ;
5415	8.94942 ;
28989	8.81836 ] ;
[C1, ia1, ic1] = unique(A,'stable', 'rows');
A(ic1==1,:)

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KSSV 2021-5-24

You have it caluclated from the function already..... C1 is the array you want.

Yro 2021-5-24

Thank you very much for your help.

Best regards.

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Answer 2

Matt J 2021-5-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/834063-find-repeated-values-in-an-array-by-column-and-rows-unique-function#answer_707875

在 MATLAB Online 中打开

A = [9.04828	8.80036 ;
04828	8.80036 ;
11259	8.74653 ;
04828	8.80036 ;
24358	8.74653 ;
9823	9.05449 ;
02563	8.24793 ;
5415	8.94942 ;
28989	8.81836 ] ;
C=num2cell(A,1);
[G,ID{1:2}]=findgroups(C{:});
ID=cell2mat(ID)
ID = 7×2
2899    8.8184
5415    8.9494
9823    9.0545
0256    8.2479
0483    8.8004
1126    8.7465
2436    8.7465