Thanks for the reply/

I know how to do that but in my case the way the velocity changes over time is non deterministic. The next value contains a random variable that it requires sampling, from a gaussian lets say, to get the next value.
So what i have done is that i run the code in python and got an array of lets say 10.000 velocity values for the 10.000 time steps of my simulation.
I want to give each element to each time step.