How to append values of a vector in a loop?

%len = length(vector)  its the length of a part of a cell array
%a = the above vector that contains string components

for i= 1:len-1
      if strcmp(a(i),a(i+1))
         scores(end+1)= scores(i);
      end
    end

I try to run the above part and it works for some of my files but for others it come up with the error:

error: scores(437): out of bound 436

I want it to append a new element (the same value as the indexed element) to the end of the scores vector if the string in the vector a is equal to the next string in the vector a

[Rik]

Why do you want to do it in a loop like this?

With this description of your code and data, I don't see any reason for this error. Can you share the actual variables?