to address a set of differential-algebraic equations

Hi there,

Many thanks!

[Torsten]

ode15i and ode15s. And since you've already used these solvers in questions you've asked before: what is your real problem ?

[Chuguang Pan]

@Tony Cheng. You should convert the high-order ODEs to first-order ODEs by setting the appropriate state variables of the system. Let , reformulating the high-order ODEs as . Then, you can use ode solver ode to solve the first-order ODEs. The initial condition of can be calculated according to the second equation.