The output result of intersect function is not as the expected one
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Xie Ya
am 12 Mär. 2015
Kommentiert: Xie Ya
am 12 Mär. 2015
For example, when I run the following codes:
Cell1 = {'C';'B';'ZN';'FU';'PM';'A';'OI';'SR';'M';'TA';'AU';'P';'RU';'CU';'Y';'L';'AL';'CF';'WH'};
Cell2 = {'B';'ZN';'FU';'PM'};
[~,Index] = intersect(Cell1,Cell2);
The expected value of Index should be [2,3,4,5] However, when I run codes in MATLAB2014b,the results I have got is [2,4,5,3].
But, when I replace Cell1 and Cell2 as:
Cell1 = {'A','B','C','D'};
Cell2 = {'A','B'};
[~,Index] = intersect(Cell1,Cell2);
I got Index = [1,2],which is the same as the expected value.
So, weird. Hope someone can tell me what the cause of this problem.
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Guillaume
am 12 Mär. 2015
By default, intersect sorts its output, and thus the indices returned correspond to that sorted order. You would have seen that had you asked for the intersection:
>>Cell1 = {'C';'B';'ZN';'FU';'PM';'A';'OI';'SR';'M';'TA';'AU';'P';'RU';'CU';'Y';'L';'AL';'CF';'WH'};
>>Cell2 = {'B';'ZN';'FU';'PM'};
>>[intersection ,Index] = intersect(Cell1,Cell2)
intersection =
'B'
'FU'
'PM'
'ZN'
Index =
2
4
5
3
If you want to keep the output in the same order as your first array, then use the stable option:
>>[intersection ,Index] = intersect(Cell1, Cell2, 'stable')
intersection =
'B'
'ZN'
'FU'
'PM'
Index =
2
3
4
5
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