how to Expand the plot line in a function

I have a struggle plotting a function in Matlab because the plotline is not complete and it's cut after certain value and because of that I cannot preview well my function. Is there a way to expand the plot line so I can see the complete function?

Answer 1

[Chris]

The default x interval for fplot is [-5 5]. You can change it with the xinterval argument:

fplot(y,[0,130])

You don't need an x argument unless x is a function (like a parametric equation)