how to get higher order derivative in ODE function

in a differential equation of this type

My'' = y' + y + a

where M is the mass matrix and a is a constant.

Using ODE solver and transforming the diff equation in the cauchy form, How can i get the solution for every step also for the y''?

Answer 1

[Mischa Kim]

Hi Giacomo, when you solve the ODE this means you have solutions for y(t) and y'(t). You can then simply use the same equation from your ode function to compute y''.

[Giacomo Db]

dear Mischa,

i thank you for your help.

my doubt was regarding the use of the events function, how can i detect an event associated with y''(t)?

[Mischa Kim]

I see. I did not see any reference to events function in your question. Please add your code and other essential information to your question above and we can try to help you figure things out.