How to match pair of two elements of a matrix with the pair of two elements of another matrix?

Question

AS 2022-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/1764855-how-to-match-pair-of-two-elements-of-a-matrix-with-the-pair-of-two-elements-of-another-matrix

评论： AS 2022-7-21

采纳的回答： Bruno Luong

I have two matrices with two columns:

A= [1 3; 5 9; 7 6; 10 8]

B = [10 8; 7 6; 70 16; 1 3; 12 34; 5 9; 20 45; 10 8]

I want to match two elements of A matrix with B matrix land find its index number.

Like [1 3] pair want to find in matrix B.

Please give me any suggestion to do this. Thank you.

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Answer 1

Bruno Luong 2022-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/1764855-how-to-match-pair-of-two-elements-of-a-matrix-with-the-pair-of-two-elements-of-another-matrix#answer_1012205

在 MATLAB Online 中打开

A= [1 3; 5 9; 7 6; 10 8]
A = 4×2
     1     3
     5     9
     7     6
    10     8
B = [10 8; 7 6; 70 16; 1 3; 12 34; 5 9; 20 45; 10 8]
B = 8×2
    10     8
     7     6
    70    16
     1     3
    12    34
     5     9
    20    45
    10     8
[tf,loc] = ismember(B,A,'rows');
rowindexInA = loc(tf);
rowIndexInB = find(tf);
rowVal = B(rowIndexInB,:);
Tmatch=table(rowVal,rowindexInA,rowIndexInB)
Tmatch = 5×3 table
     rowVal     rowindexInA    rowIndexInB
    ________    ___________    ___________

    10     8         4              1     
     7     6         3              2     
     1     3         1              4     
     5     9         2              6     
    10     8         4              8     