Plotting ordered pairs.

I want to plot x(i) and y(i) as ordered pairs, but am having difficulty doing this. Below is the code of the recursive for loop I'm using.

r(1)=1;
x(1)=1;
y(1)=0;
vx(1)=0;
vy(1)=2*pi;
dt=.002;
for i=2:400
    r(i)=r(i-1);
    vx(i)=vx(i-1)-(4*pi^2*x(i-1)/r(i)^3)*dt;
    x(i)=x(i-1)+vx(i)*dt;
    vy(i)=vy(i-1)-(4*pi^2*y(i-1)/r(i)^3)*dt;
    y(i)=y(i-1)+vy(i)*dt;

end

Can anyone help?

[Thorsten]

So what's the problem?

Answer 1

[Star Strider]

All you need to do is to add this code after your loop:

figure(1)
plot(x, y)
grid
axis equal

to get this plot: