get the value of element from matrix

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ha ha
ha ha on 17 May 2019
Edited: Stephen23 on 17 May 2019
Let's say: I have matrix A, B
A=[1 1 200; 2 2 2;9 9 9; 5 5 5; 3 3 355];%matrix 5x3
B=[9 9; 1 1; 3 3]%matrix 3x2
How can I call the result matrix somehow the value of two first column in matrix A is the same as in matrix B?
result=[9 9 9; 1 1 200; 3 3 355];

Accepted Answer

Stephen23
Stephen23 on 17 May 2019
Edited: Stephen23 on 17 May 2019
Simply use ismember and basic MATLAB indexing:
>> [X,Y] = ismember(B,A(:,1:2),'rows');
>> Z = A(Y(X),:)
Z =
9 9 9
1 1 200
3 3 355

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