ts = [1 2 3 4 3 2 1 0 -1 -2 -3];
threshold = [-3.5 3];
correction = [1 -1];
for i = 1:numel(ts)
    if ts(i) > threshold(2)
       ts(i:end) = ts(i:end) + correction(2);
   elseif ts(i) < threshold(1)
       ts(i:end) = ts(i:end) + correction(1);
   end
end
disp(ts)

[1 2 3 3 2 1 0 -1 -2 -3 -3]