Vector to Indicate if Data equals the Maximum by group

I have a data vector and a group vector, how do I generate a vector (the same size as the data vector) of 0's and 1's to indicate if data is the group maximum. For example, data = [1;2;3;6;5] and group = [1;1;2;3;3]. I want to get [0;1;1;1;0].

Answer 1

[Akira Agata]

How about the following?

data = [1;2;3;6;5];
group = [1;1;2;3;3];

idx = splitapply(@(x) {x == max(x)},data,group);
idx = cell2mat(idx);

disp(idx)

   0
   1
   1
   1
   0