Find indices of one array in another array.

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Hampus Alfredsson
Hampus Alfredsson 2018-3-28
编辑： Stephen23 2018-3-28
I have two different sized two column arrays, like the example below:
A = [1 1; 1 2; 2 2; 2 3; 3 3; 3 4; 4 3; 4 4];
B = [1 1; 2 2; 3 3; 4 4];
Now I want to find the indices of the rows in A that are equal to B. So the answer should be:
idx_rows = [1 3 5 8]
How can I do this?
Thanks!

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采纳的回答

Birdman
Birdman 2018-3-28
编辑：Birdman 2018-3-28
[~,idx]=setdiff(A,B,'rows');
idx_rows=setdiff(1:size(A,1),idx)

更多回答（1 个）

Stephen23
Stephen23 2018-3-28
编辑：Stephen23 2018-3-28
The simplest solution is to use ismember:
>> A = [1 1; 1 2; 2 2; 2 3; 3 3; 3 4; 4 3; 4 4];
>> B = [1 1; 2 2; 3 3; 4 4];
>> [~,idx] = ismember(B,A,'rows')
idx =
1
3
5
8

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