Hi,

I have read a related post but no solution was provided I believe because the question was not clear. I will try to explain clearly what I am asking here.

The point is that in the code you have to specify something like this:

`dx_dt = x*theta[1]`

But what if I know that the parameter theta[1] has different values at different time points?

`x(t+1)=x(t)*theta[1,t]`

For instance, let’s imagine I know that it has 2 different values, then I could use to 2 parameters doing something like this:

`x(t+1)=x(t)*theta[1]*(t<k)+x(t)*theta[2]*(t>=k)`

where `k`

can be fixed or even another parameter.

Is this possible?

Thanks!!!