How I make my phase portrait for several initial condition?

I'm trying to draw several trajectories for my phase portrait. As an example I'm attaching the file of my function and code to integrate it.

How I put there command like if my parameter is less than or greater than 1/8.

[darova]

The question is unclear. Please explain more

[priya anjali]

I mean to say that plotting for different initial conditions I have to put number of command 'hold on' to execute it. So I'm asking that how to plot for several initial conditions at a time.

Answer 1

[darova]

Here is a simple example

x0 = [1 2 3];
for i = 1:length(x0)
    [t,x] = ode45(f,[0 2],x0(i));
    line(t,x)
end

[priya anjali]

but where should I place this in my code?

[darova]

It's just an example. Put ode45 solver inside for loop and get several different solution varying initial condition x0

[priya anjali]

It's showing some error.