I’m not exactly certain what you’re actually asking, since my interpretation of your question is covered in the ode45 documentation. You haven’t listed the code for your ‘odefun’, or described what you want to do, so I’m guessing here.
If I understand correctly, what you want to do is a common way of passing extra parameters to your ODE function.
To use it with ode45, you only pass the ODE solver the ‘t’ and ‘y’ variables:
[t,y] = ode45(@(t,y) odefun(t,y,a,b,c), tspan, ic);
Note that ‘a’, ‘b’, and ‘c’ have to exist in your workspace.
