How to tell ode15s to change its max time step for a specific short time range?

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I have a dynamic system coded in Matlab and solved using ode15s, and it works fine except it is slow because of the system size. I must give the solver a small step size (say 1e-4) for a very short time (0.05 s - 0.1 s) when there is a chnge in the system network. The rest of simulation time (20 s) can be simulated with a step size 1e-1 and it gives a satisfactory result. Is there is any possibility to tell the solver to change its step size (max. step size) during this short time?

Accepted Answer

Torsten on 12 Jun 2019
Integrate from 0 to 0.05, restart the solver and solve from 0.05-0.1, restart the solver and solve from 0.1 - 20. Every time you restart the solver, you can change the maximum step size.

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