[yt-users] halo finding on a volume subset

[Christine Simpson]

Hi all,

This is a follow up on this discussion from a month ago.  I want to do
the same thing Irina wanted to do--run hop on a smaller region in my
simulation box.  I read this discussion, but I'm a python neophyte and
I'm not sure I follow what to do.  Could someone post an example script?
I'd really appreciate it.

Thanks
Christine

On Tue, 2010-09-21 at 14:57 +0200, Irina Dvorkin wrote:
> 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
> >> ________________________________(_)_\(_)_______________
> >>
> >> _______________________________________________
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> >>
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> 
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