Help with Basic Definition of Systems in MATLAB

I am trying to use ode45 to solve a second order differential equation mu''+cu'+ku=Asin(2pift) where prime is a derivateive with respect to time, and I know that I can convert it into a system of first order equations, but I don't understand how such a system is supposed to be represented in MATLAB syntax and passed into ode45 as a single function handle input. I would appreciate some help on what the code looks like for a second order differential equation converted into a system of first order differential equations.

Answer 1

[Steven Lord]

Take a look at the van der Pol examples in the Examples section of this documentation page.