# Geodesic Won't Plot

```
%display latex
M = Manifold(3, 'M', structure='Lorentzian')
X.<t,x,y> = M.chart('t x y')
X
v=.5
r=sqrt((x-v*t)^2+y^2)
f=(tanh(r+4)-tanh(r-4))/(2*tanh(4))
g = M.metric()
g[0,0] = (v^2*f^2-1)
g[0,1] = -v*f
g[1,1] = 1
g[2,2] = 1
g.display()
p = M((0,0,1), name='p')
v = M.tangent_space(p)((2/3,1,0), name='v')
v.display()
s = var('s')
c = M.integrated_geodesic(g, (s, 0, 10), v, name='c')
sol = c.solve()
interp = c.interpolate()
graph = c.plot_integrated()
p_plot = p.plot(size=30, label_offset=-0.07,
fontsize=20) v_plot =
v.plot(label_offset=0.05, fontsize=20)
graph + p_plot + v_plot
```

This either doesn't work or takes an indeterminate amount of time to plot. However, if I change v from 0.5 to 1, it does fine. Any idea why that is?