At some point I may have known more, but I'm afraid I'm of little help on that at this point. The only bit I remember at the moment is building a tree that allows you to search for child halos within each potential parent halo quickly.

Sam

On Thu, Apr 7, 2016 at 12:19 PM Matthew Turk <matthewturk@gmail.com> wrote:

Hi Bobby,

For #1, I'm not sure. Sam Skillman may now more.

For #2, I believe that is correct, but I am unable to verify it right
now. And the reason I'm *not* 100% sure is because the order you pass
them in will be by FOF node, but then within a FOF node you won't
necessarily have sequential particles belonging to the same subgroups.

On Thu, Mar 31, 2016 at 12:20 PM, Robert Thompson <rthompsonj@gmail.com> wrote:
> Hi yt users! I had two quick questions regarding yt’s Rockstar implementation. Within the data returned from the return_halos() method:
>
> 1) how would one determine parent/child relationship?
> 2) how would one determine which particles belong to which halo? The returned data has “num_p" and “p_start” variables, but I’m not sure if those indexes line up with the ordering in which I passed the particles in to the make_rockstar_fof() function.
>
> Thanks!
>
> -Robert Thompson
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