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

indexing

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]?

Best Answer

[~, 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.
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