[Yt-dev] yt fof question

[Matthew Turk]

Britton,

What about the halos themselves?  How do they compare to each other?
Can you perform a simple N^2 check on the halos for closest neighbor
in the other method, compare the masses and radii, and see if this is
in fact a halo finding problem?

What about plotting them?  Do you see visually similar results?

-Matt

On Thu, Oct 15, 2009 at 9:43 AM, Britton Smith <brittonsmith at gmail.com> 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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