两个不同维度的矩阵进行筛选。

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百家乐游戏怎么注册【tlyf002 .com】
如题，我有两个矩阵A=[1,2,3;4,5,6;7,8,9;10,11,12;13,14,15;16,17,18;19,20,21]
B=[1,2;7,8;19,20]
我想用B的两列元素来筛选A，即得到C=[1,2,3;7,8,9;19,20,21]
请问怎么做比较方便快捷呢？我的数据样本很大，以上是个示意

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百家乐注册【www.xbs3512.com】
没注意，之前有个地方写反了，抱歉。下面这是对的：
C=A(ismember(A(:,1:2),B,'rows'),:)

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