I need to remove the straight line. any ideas on the code? i have try (1:end-1) but it wont work. thanks

Answer 1

[Rik]

Assuming your data is in variables named t and y, putting the following code before the call to plot should fix your issue.

[t,order]=sort(t);
y=y(order);

[Shaun Lim]

It's works. Thanks^^