Re: [ESPResSo-users] randomness in Langevin thermostat

[Henri]

Hi Reza,

The random number generator can be seeded by setting the value "system.seed".

You can find out about it in the documentation.
http://espressomd.org/html/doc/espressomd.html#espressomd.system.System.seed

The samples folder also has a minimal example of its usage.
https://github.com/espressomd/espresso/blob/python/samples/minimal_random_number_generator.py

Happy new year to you too!
Kind regards,
Henri

On Mon, 2018-01-01 at 23:16 +0330, Mohammadreza Niknam Hamidabad wrote:
> Hi all,
> 
> I've got a confusing problem. I have a Langevin thermostat in my system and I 
> put  particles in my
> simulation box. Every time I run for a 1000 time steps and print the position 
> of a specific
> particle, I've got exact same X Y Z for that particle in all of my runs. So 
> how can I simulate
> movement of a drop of ink in water (Diffusion)? 
> Is there any seed for randomness in Langevin?
> " system.thermostat.set_langevin(kT=1.2, gamma=1.0) "
> 
> By the way happy new year.
> 
> sincere,
> Reza
> 
>