如题,矩阵A=
1 2 1 1
1 2 2 2
1 2 3 3
3 4 1 4
3 4 2 5
3 4 3 6
B=
1 2 3
3 4 5
当B的前两列和A相同时,用B的第三列替换A的第三列,即C= 1 2 3 1
1 2 3 2
1 2 3 3
3 4 5 4
3 4 5 5
3 4 5 6请问要怎么做呢

 Accepted Answer

C=A;
[Lia,Locb]=ismember(A(:,1:2),B(:,1:2),'rows')
C(Lia,1:3)=B(Locb,:)

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