[yt-dev] advice on implementing halo member particle loading

[Cameron Hummels]

Hi Britton,

I like this idea in general.  Just to confirm, the output of your code
snippet would return a list of particle masses, one for each particle
contained in the halo?

Cameron

On Thu, May 7, 2015 at 7:57 AM, Britton Smith <brittonsmith at gmail.com>
wrote:

> Hi everyone,
>
> Myself and one other who should be joining this list soon are interested
> in implementing some new functionality and I would like to solicit some
> advice.
>
> What we have are halo catalog datasets that, for the most part, are
> already loadable in yt.  They are loadable in that each individual halo is
> a particle such that querying the mass field returns the mass of each
> halo.  However, these datasets also store the particles from the simulation
> snapshot that are the members of each halo.  We currently do not have the
> machinery to query them and this is what we would like to add.
>
> It seems the most sensible idea is to create a halo data container such
> that something like the following returns the mass of all the particles in
> a halo:
>
> my_halo = ds.halo(some_id)
> my_halo["particle_mass"]
>
> This is somewhat different from the existing data containers as it is not
> geometric.  The member particles are explicitly known.  I don't have much
> experience with making data containers so I can't tell if this makes things
> easier or harder.  Anyway, this is the plan.
>
> If anyone has reasons this may be too difficult or simply not work, I
> would appreciate hearing them.  Any general advice or other ideas for
> making this functionality work would also be welcome.
>
> Thanks!
>
> Britton
>
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>
>


-- 
Cameron Hummels
Postdoctoral Researcher
Steward Observatory
University of Arizona
http://chummels.org
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