Clear Filters
Clear Filters

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

1 view (last 30 days)
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]?

Accepted Answer

Walter Roberson
Walter Roberson on 27 Oct 2018
[~, 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.

More Answers (1)

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

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!