Full implicit ode solver

Hello. I need to solve an ode as full implicit. Finally in 2024b release the option has been add. With ode15i it works, but i want also to try with idas solver (sundials package is the best for ode solving) setting equationtype as fullyimplicit: I use initialslope to pass the first set of Xp at the ode funcion in form X=f(t,x,Xp) but, with idas, Xp in the function seems to be a [] variable. With ode15i it not happen. Can someone help me finding a way to pass correctily the input?

[Torsten]

You forgot to include your code.

[Sandeep Mishra]

Hi @Alessio Capelluto,

I also encountered a similar issue while attempting to solve a fully implicit ordinary differential equation using the 'ode' function with the 'idas' solver in R2024b.

It seems that currently, the 'ode15i' solver is the only option that effectively handles this scenario.