[yt-users] HOP and FOF for filtered particles

[José Utreras]

Hi Hillary
Ok, I will look into that and see if works.
Thanks a lot!

2015-09-03 13:05 GMT-04:00 Hilary Egan <hilary.egan at colorado.edu>:

> Hi José,
>
> Unfortunately the old halo finders (HOP/FOF) don't accept a particle type
> keyword argument at the moment.
> There's a work in progress PR that implements a new version of FOF that
> should allow you to specify a particle
> type, it just hasn't been merged into mainline yt because it's not
> completely tested. It's available here
> (
> https://bitbucket.org/yt_analysis/yt/pull-requests/1618/wip-hybrid-rockstar/)
> if you wanted to test it out, and
> you could run the new version of FOF as follows:
>
> ```
> from yt.analysis_modules.halo_analysis.api import HaloCatalog
>
> ...
>
> hc = HaloCatalog(data_ds=ds, finder_method='yt_fof',
>
>  finder_kwargs={'particle_type':'my_particle_type'})
> hc.create()
> ```
>
> Sorry thats not completely helpful, but hopefully we should have this
> fully implemented soon!
>
> -Hilary
>
> On Thu, Sep 3, 2015 at 10:45 AM, José Utreras <jutreras at das.uchile.cl>
> wrote:
>
>> Hi Nathan!
>>
>> I thought in using the filters but I don't see how to pass this
>> information to the group-finder methods before the groups are identified.
>>
>>
>>
>> 2015-09-02 15:49 GMT-04:00 Nathan Goldbaum <nathan12343 at gmail.com>:
>>
>>> I'm not sure how it interacts with the halo finding / FOF machinery, but
>>> you may be interested in this docs page on particle filters:
>>>
>>>
>>> http://yt-project.org/docs/dev/analyzing/filtering.html#filtering-particle-fields
>>>
>>> On Wed, Sep 2, 2015 at 2:43 PM, José Utreras <jutreras at das.uchile.cl>
>>> wrote:
>>>
>>>> Hi everyone
>>>>
>>>> I'm working with Enzo and I'm trying to identify groups of stars
>>>> particles. Now I wanted to create groups but only of young stars. I thought
>>>> using HOP but I don't see how to filter particles before crating the groups.
>>>>
>>>> Thanks!
>>>>
>>>> Jose
>>>>
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>
>
> --
> Hilary Egan
> Astrophysical and Planetary Science Department
> University of Colorado Boulder
>
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