[Yt-dev] yt fof question

John Wise jwise at astro.princeton.edu
Thu Oct 15 09:46:55 PDT 2009


Hey Britton and Stephen,

Unless it was already obvious, I just wanted to chime in that the  
inline FOF uses the same particles IDs in the main calculations of enzo.

John

On 15 Oct 2009, at 12:43, Britton Smith wrote:

> Stephen,
>
> It looks like if I take any random particle in a halo made with yt  
> FOF, it's in a completely different halo in inline FOF, or not in  
> any halo at all.  Michele is checking this out right now, but it  
> basically looks like the particle lists for the same halo found with  
> the two different methods are completely different.
>
> Britton
>
> On Thu, Oct 15, 2009 at 10:22 AM, Stephen Skory <stephenskory at yahoo.com 
> > wrote:
> Britton,
>
> >I'll check the yt FOF IDs against Enzo right now.  The halo output  
> of the code seems just fine, so if there's a bug, it's minor.  I'll  
> let you know what I find.
>
> I remembered that the kD tree yt FOF uses is a bit inaccurate, and  
> that could be a source of difference between the two sets of FOF  
> haloes. But you said the differences were huge, and the kD  
> inaccuracy should give only small differences, especially in FOF.  
> Just a thought.
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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