Remove line between first and last point on plot

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

[manateejoe]

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

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

Answer 2

[Honglei Chen]

Are you sure your last point and first point are not the same? If they are, simply do

plot(time(1:end-1),avg(1:end-1))

[manateejoe]

No, they are different: first point: 371.447, last point: 380.805. With this method, I still get the line in between

[Star Strider]

See if:

time = [data(:,1); NaN];
avg = [data(:,2); NaN];

improves the plot.

If your data.txt file is not too large, attach it (use the ‘paperclip’ icon). Without it, it is only a guess as to what the best solution is.