ending a line in a plot

I need to make a ramp for a "motorcycle jump" simulation that is 15 m long and end there with angle chosen by user. In the axes I can't figure out how to get the line to stop at 15

% Equations for plot

%L is the length
%angle is alpha
alpha = input('input ramp degree: ')
L=15

ramp =(L*cosd(alpha));
ramp = [0, 15]

plot([x])

xlim([0,70])
ylim([0, 70])

[Image Analyst]

Try

xlim([0, 15]);

but, what is x?

[andrew krugle]

That does limit the entire graph to 15 but I was looking to have the graph be 70 long and the line end at a length of 15 like this

Answer 1

[Image Analyst]

For what it's worth, see my attached demo on projectiles. It computes just about everything you could possibly ever want to know about a projectile, and give you lots of input parameters like angle, initial velocity, initial height, etc.