Hi everyone,

I would like to use Symplectic Integrators such as `VelocityVerlet`

or `VerletLeapfrog`

from DifferentialEquations.jl to ensure the time-reversibility of the equation of motion.

Nonetheless, my problem can not be set as a `DynamicalODEProblem`

.

My equation of motion is just:

`\frac{du}{dt} = f2(u)`

where v = f2(u) is a model for the velocity which depends only of the position u )

Since my function f2 is not a function of the velocity v but only of the position u, I can not use these symplectic integrators.

Is there a way to get around this issue?

Thank you for your time,