Change value of parameter and u0 after init ODEProblem DifferentialEquations.jl

Specific Domains Modelling & Simulations
1

Hello!
How can I change the parameter value and initial conditions after initialization ODEProblem?

I tried to change u0 using prob.u0 = newu0
But I got a warning
Warning: Mutation of ODEProblem detected. SciMLBase v2.0 has made ODEProblem temporarily mutable in order to allow for interfacing with EnzymeRules due to a current limitation in the rule system. This change is only intended to be temporary and ODEProblem will return to being a struct in a later non-breaking release. Do not rely on this behavior, use with caution.
I managed to change u0 using remake, but I don’t quite understand how to change a specific parameter using it.

Thank for your helps

2

You can do prob.p[i] = x

3

I tried this
It is redefined the value of parameter in the array of parameters that was passed to ODEProblem

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4

Yes is that not what you asked to do?

5

Yes, but changed array param
It seemed to me that it should remain unchanged. I changed prob.p, not param

6

Yes it changes the array. That’s just mutation. If you want to not use mutation, then remake is the right thing to use.

7

Thank you
Is it possible to change only one parameter using remake?

8 
newp = copy(prob.p)
newp[i] = x
newprob = remake(prob, p = newp)
9

Thank you!