Can mrgsim_q() have an option to change maxsteps?

[annabel-meade]

I am trying to optimize parameters, so I would like to use the faster mrgsim_q() over mrgsim(). However, my model spits an error if I do not increase the maxsteps from 20,000 to 500,000. Is there a way to change maxsteps in mrgsim_q(), or am I misunderstanding the purpose of this function?

[kylebaron]

Hi @annabel-meade -

The different solver settings are stored in the model object. You can change them through the update() method. See the example here: https://mrgsolve.org/user-guide/components.html#solver-settings

The difference here with mrgsim() and mrgsim_q() is that mrgsim() has a ... argument so you can pass arguments through ... to update() as a part of the call to mrgsim(); it's old functionality and probably a little confusing but we keep it for convenience.

So if you're writing this mrgsim() code:

mod %>% mrgsim(maxsteps = 500000)

just change it to this:

mod <- update(mod, maxsteps = 500000)

mod %>% mrgsim_q()

Hope this helps; please let me know if I've misunderstood your question.

Kyle

[annabel-meade]

Thank you, this helped a lot!