match row and column

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Tanmoyee Bhattacharya
编辑： Stephen23 2016-2-25
I have one matrix
a=
1 3 0
2 5 0
3 7 0
4 8 0
5 10 0
and another is
b=
5 10
3 7
I want to do find(a(:,1)=b(:,1) & a(:,2)==b(:,2) so that
5 10 0
3 7 0

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Stephen23
Stephen23 2016-2-25
编辑：Stephen23 2016-2-25
You can use ismember to generate the logical indices. In the same order as a:
>> idx = ismember(a(:,1:2),b,'rows');
>> a(idx,:)
ans =
3 7 0
5 10 0
Or in the same order as b:
>> [~,idx] = ismember(b,a(:,1:2),'rows');
>> a(idx,:)
ans =
5 10 0
3 7 0

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