how to eliminate undesidered lines

my function is the quasi-sinusoidal signal but i don't want those lines which link the beginning and the end of the plot. What should I do?

Answer 1

[Star Strider]

Use the sort or sortrows function to sort your data by the independent variable values.

Answer 2

[Image Analyst]

It looks like the last point is the same as the first. You could just plot all except the last point:

plot(x(end-1), y(end-1), 'g-', 'LineWidth', 2);