[yt-users] halo finding on a volume subset

[Irina Dvorkin]

Matt and Stephen,

I followed Matt's idea and it worked great in my simple case.
Thanks a lot, it saves quite a lot of time!

Irina

Quoting "Matthew Turk" <matthewturk at gmail.com>:

> Stephen,
>
> This *was* possible.  Until Irina emailed, I was under the impression
> it still was; I don't know why the functionality was removed.
>
> I believe that changing the data_source check and construction should
> make this possible, similarly to how the projection mechanism checks
> if a source has been provided.  The only variables that are required
> to be initialized in __init__ related to the data_source are padding
> and _data_source; if _data_source is supplied (i.e., add on
> data_source to the contructor) and "is not None" then it should simply
> set padding to 0.0 and set self._data_source equal to the supplied
> source.
>
> -Matt
>
> On Mon, Sep 20, 2010 at 8:40 AM, Stephen Skory  
> <stephenskory at yahoo.com> wrote:
>> Irina,
>>
>>
>>
>>> Is there a way to run the halo finder on part of the  simulation volume?
>>> For example, I have a box 256 Mpc on a side but I only  want to find halos
>>> inside a smaller box, say 20 Mpc on a side.
>>
>>
>> Unfortunately, this is not currently possible in yt. However, it should be
>> possible if the right modifications are done. Something along these  
>> lines is how
>> HOP/FOF are parallelized, so it should be translateable to your  
>> problem. I am
>> not making promises that I will do this, but that it is possible. I'll think
>> about it.
>>
>> However, I wonder why you only want halos in a small region? Do you have a
>> nested simulation? Does it seem like the halo finding is taking too  
>> long? Are
>> you looking for substructure? Depending on the answers to these  
>> questions, the
>> modifications discussed above may not be required.
>>
>>  _______________________________________________________
>> sskory at physics.ucsd.edu o__ Stephen Skory
>> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
>> ________________________________(_)_\(_)_______________
>>
>> _______________________________________________
>> yt-users mailing list
>> yt-users at lists.spacepope.org
>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>
> _______________________________________________
> yt-users mailing list
> yt-users at lists.spacepope.org
> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>