duplicating strings in a cell array

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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.

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)

madhan ravi 2023-12-2

[~, b, c] = unique(name); 
idx = b(accumarray(c, 1) > 1)

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