how find idx string deleted

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piero
piero on 29 Nov 2023
Answered: Fangjun Jiang on 29 Nov 2023
a={'aa','bb','cc','aa'}
a = 1×4 cell array
{'aa'} {'bb'} {'cc'} {'aa'}
unique(a,'stable')
ans = 1×3 cell array
{'aa'} {'bb'} {'cc'}
%i want to find idx string deleted..( idx=4)

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 29 Nov 2023
a={'aa','bb','cc','aa'};
[b,ida,idb]=unique(a,'stable')
b = 1×3 cell array
{'aa'} {'bb'} {'cc'}
ida = 3×1
1 2 3
idb = 4×1
1 2 3 1
setdiff(1:numel(a),ida)
ans = 4

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