How to find mutual arrays position of multiple matrices with different length

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UNK
UNK 2018-10-27
评论： UNK 2018-10-27
I have two matrices and I want the corresponding all indices, not just the first one. Here is the example
A = ...
[2 2 4
4 5 4
1 1 4
4 3 2
1 2 4
2 4 4
1 4 1
1 1 1
5 3 3
4 3 5
4 5 4]
and
B = [ 1 4 1
4 3 5
4 5 4]
I used intersect as follows and got the following output:
[AB,ia,ib] = intersect(A,B,'rows')
AB =
1 4 1
4 3 5
4 5 4
ia =
7
10
2
ib =
1
2
3
is it possible to get ia = [7 10 2, 11]?

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采纳的回答

Walter Roberson
Walter Roberson 2018-10-27
[~, rowidx] = ismember(A,B,'rows');
locs = accumarray(rowidx+1, (1:length(rowidx)).', [], @(v) {v});
ia = locs(2:end);
This needs to be a cell array because there are multiple results for some values.

更多回答（1 个）

madhan ravi
madhan ravi 2018-10-27
编辑：madhan ravi 2018-10-27
>> b=find(ismember(A,B,'rows'))'
b =
2 7 10 11
>>

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