hold on is not working

The graphs clears up when plotting u,v. It does not hold on.

[x,y]=meshgrid(0:.5:4,0:.5:4);

m=(y-1)*(x+2);

L=sqrt(1+m.^2);

quiver(x,y,1./L,m./L);

hold on

f=@(u,v)(v-1)*(u+2);

[u,v]=ode45(f,[0 5],3);

plot(u,v)

Answer 1

[DGM]

There's nothing wrong with hold on. Pay attention to the range of the data.

The quiver plot has a y range of about [-1 5], whereas the plot of u,v spans [3 12E9]. The quiver plot is reduced to a line.

I don't know why you'd be doing a quiver and line plot in the same axis anyway. Just use a subplot or something.