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How to find indices of similar values in a vector?

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I want to get the indices of similar values in a vector. For example, I have a vector x=[1 1 2 2 3]. The output should be something like this: indices = 1,2 & 3,4

Accepted Answer

Rob Campbell
Rob Campbell on 1 Aug 2017
Edited: Rob Campbell on 1 Aug 2017
I'm unsure if you're looking for sequential numbers or not. The following just looks for repeats. Does it do what you want?
x = [1,1,2,2,3,4,5,6,1,2,3];
% Store in a cell array the indexes of values that repeat
reps={};
for thisU=unique(x)
f=find(x==thisU);
if length(f)>1, reps{end+1}=f; end
end

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