find all similar index of array in Matlab

Question

I have a array X=[1 2 3 1.01 2.01 4 5 1.01 3.01] I want to all index of this array are similar and difference<=0.01 in matlab answer is

Answer 1

Y=cell(5,1)
for idx=1:numel(Y)
   Y{idx}=find(abs(X-idx)<=.2);
end