ODE45- How to pass parameters out

Hi, Can anyone tell me how I can pass parameters out of a ODE when they are not being calculated as part of the differential equation but are subsidiary values. Wha I want to do is write them out at the end of a successful timestep (i.e. not get the values calculated with trial time step sizes)?

Is there a clever way to use global to do this?

Answer 1

[Richard Brown]

Why don't you just solve your ODE first, and then call the RHS function, modified to print out your parameters of interest, at the timestep values?

[Jan]

There is no reliable way to check inside the ODE function, if a step is a trial or accepted step. Function evaluations can be used to find event values also.