While I appreciate your confidence in me, I would not deprive you of the fun of evaluating this yourself. I will guide you through the analysis and setting up your ODE in terms ode45 will understand.
Your ODE is of the form:
c(1)*y" - c(2)*y' + c(3)*y = f(y)
that is actually straightforward to analyse. Since y"=(y')', your ODE can be expressed in three terms here, y(1) = y', y(2) = y(1)' = y", and y.
So we have:
y(1) = y(2)
y(2) = (f(y(1)) - c(3)*y(1) - c(2)*y(2))/c(1)
I have every confidence that you can take it from here. The documentation for ode45 will also help you.
If you have problems getting your code to work, post your ODE function and your ode45 call and related code, and I will help you troubleshoot it.
