You already have all the data from all the files, stored in T1.
You can remove this loop:
for i = 1 : 327
{
T1i} = T1{1,i}
};
end
and just refer to T1{1}, T1{2}, etc., later in the code when you need to process the contents of each cell of T1. Example:
for i = 1 : n
% do something with T1{i}
current_mean = mean(T1{i},1); % whatever
end
