Extract Common and Uncommon Matrix with Row Repetition

Question

Mukund 2018-3-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/390385-extract-common-and-uncommon-matrix-with-row-repetition

评论： Stephen23 2018-3-24

I want to segregate common and uncommon matrix with row Repetition. Current matlab commands ismember and setdiff do it by removing repeated rows.

A=[2 3 4;4 1 2;3 5 7;2 8 1;2 3 4;5 5 5;4 1 2;4 1 2; 5 5 5]
B=[2 3 4;4 1 2;2 8 1]
c=ismember(B,A,'rows')
C=A(c,:)
D=setdiff(A,B,'rows')
C=[2 3 4;4 1 2;3 5 7] % Not the expected ans
D=[3 5 7; 5 5 5] %Not the expected ans (because no rows repetition).

I want the output with rows repetition. Expected output is

C=[2 3 4;4 1 2;2 8 1;2 3 4;4 1 2;4 1 2] % Common Matrix
D=[3 5 7;2 8 1;5 5 5; 5 5 5]% Uncommon matrix.
How it could be done?

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Answer 1

Birdman 2018-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/390385-extract-common-and-uncommon-matrix-with-row-repetition#answer_311672

在 MATLAB Online 中打开

c=ismember(A,B,'rows')
C=A(c,:)
D=A(~c,:)

Note that

2 8 1

row is both located at A and B matrices, therefore your D matrix should look like

D=[3 5 7;5 5 5; 5 5 5]

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Stephen23 2018-3-24

@mukind: What would you hope to change? ismember already returns an index that does exactly what you want. And by the very definition of sets setdiff does not return duplicates.

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