duplicating strings in a cell array

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AT_HYZ
AT_HYZ 2023-12-2
评论： madhan ravi 2023-12-2
I have a cell array like this:
name = {'aa', 'bb', 'bb','cc','cc','ee','ff','ff','ff'};
I would like to get the indices which are duplicated. Idx = 2,4,7.
I use strcmp and it didn't work.

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madhan ravi
madhan ravi 2023-12-2
编辑：madhan ravi 2023-12-2
[~, b, c] = unique(name);
idx = b(sum(b(c) == unique(b(c)).') > 1)

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