How to quickly obtain the row indices in the original matrix A for a sub-matrix B?

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Benson Gou 2021-2-2

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评论： Benson Gou 2021-2-3

Dear All,

I have an original matrix A and a sub-matrix which is formed by selected rows from A. Now given A and B, how can I find out the row indices of B in A?

For example,

A = [

0 0 1 0 -1

2 -1 0 0 0

-1 0 -1 0 0

0 0 3 -1 -1

0 0 -1 1 0

0 0 -1 0 1

];

B = [

0 0 1 0 -1

0 0 3 -1 -1

0 0 -1 1 0

0 0 -1 0 1

];

The indices should be ind = [1 4 5 6].

Thanks a lot.

Benson

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采纳的回答

Stephen23 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734065-how-to-quickly-obtain-the-row-indices-in-the-original-matrix-a-for-a-sub-matrix-b#answer_612825

在 MATLAB Online 中打开

[~,Y] = ismember(B,A,'rows')
Y = 4×1
     1
     4
     5
     6

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Benson Gou 2021-2-3

Hi, Stephen,

Thanks a lot for your great help. It works very well.

Benson

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