Line Between First And Last Point

I'm drawing a chart, using the plot(x, y) command where x and y are arrays. In the resulting chart I have the first and last point connected by a line. How to avoid the first and

Solution 1:

I had similar problem as you can see:

BEFORE

I just sorted x using this:

x = sorted(x)

And the line disappeared as you can see: (But the data is disturbed due to sorting).

AFTER SORTING

You must also make sure the respective y values should also be accordingly arranged for the sorted x. The final output is here:

FIXED