special sorting

special sorting! i have the input vector of flags for different segments of the vector (flags are distributed randomly). how can i sort it to get the output? basically it reads from the beginning of the vector and labels each segment of the vector consecutively. there is no repetitive flags in the input vector for different segments.

input = [2 2, 5, 6 6 6, 1 1 1 1, 4, 3 3]

output= [1 1, 2, 3 3 3, 4 4 4 4, 5, 6 6]

[Paulo Silva]

Sorry but I can't understand, you show the flags (input) and the output but no original vector to be sorted

[Hamed Amini]

Sorry, I think I was not clear enough. What I was looking for was what Jan did below.

Answer 1

[Jan]

Do not use "input" as name of a variable, because it is a name of a built-in function.

in  = [2, 2, 5, 6, 6, 6, 1, 1, 1, 1, 4, 3, 3];
out = cumsum([1, diff(a) ~= 0]);
>> out = [1 1, 2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6]

[Hamed Amini]

Thanks for the clever solution and the hint about the variable names.

[Paulo Silva]

Now I see what was the objective, +1 vote