MATLAB: Remove line between first and last point on plot

Question

I am plotting data from a text file, however, the plot automatically connects the first and last points. How do I get rid of this line?

data = load('data.txt');
time = data(:,1);
avg = data(:,2);
plot(time, avg)

Answer 1

I was able to figure it out: I had to sort my data:

   [time, dum] = sort(time);
   avg = avg(dum);