How to compute compute new paramter for each particle about reboundx

[dtamayo]

Can't type much now, but you can store values by setting them as parameters on particles as shown in the getting started section of the doc

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On Jan 7, 2018, at 1:09 PM, MilevaE ***@***.***> wrote: Hi everyone, I was trying to code a module to compute a external force exerted in each particle in the simulation. Following the examples is straightforward. However, once the force is computed and the new acceleration is given: p->ax += fyork_x p->ay += fyork_y p->az += fyork_z I would like to store, for each particle a new parameter,f_di,which is given by the force computed previously times velocity, so something like: f_di = fyork_x*dvx+fyork_y*dvy+fyork_z*dvx any suggestion about how can I do that? thank you very much! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[MilevaE]

Hi Dan,

thanks for your reply =)

Sorry, but I'm still confuse. Please, if you have some time, could you give some example?

Don't be worry, and please no pressures at all. Just if you have some time, I don't want to bother you

Thanks in advance!

best

mileva

[dtamayo]

Hi Mileva,

Here's the C QuickStart guide: http://reboundx.readthedocs.io/en/latest/c_quickstart.html

It's worth reading all of it (it's short), but specifically starting from "The same goes for a particle" shows you how to store the value on a particle with a specific example. You can just change the name for your needs.

You can then get the parameter the next timestep or whenever with rebx_get_param as shown on the same page just below. Hope that helps!

[MilevaE]

Thanks Dani!