[Yt-dev] yt fof question

[Britton Smith]

Stephen,

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.

Thanks for your input.

Britton

On Thu, Oct 15, 2009 at 9:53 AM, Stephen Skory <stephenskory at yahoo.com>wrote:

> Britton,
>
> >I think this question is mainly for Stephen and possibly John, if he's on
> this list.  I was trying to make a direct comparison between the halos found
> with yt FOF and with John Wise's FOF for the same simulation.  The mass
> functions definitely look the same, but the particle membership for any
> given halo is totally different.  I'm sure this is just a matter of the
> particle indexing.  Does yt FOF use the particle IDs from enzo, or some
> different system?  Any ideas for how I might correct this issue would be
> greatly appreciated.
>
> Unless there is some bug inside of the FOF code, or in the interface
> between yt and the FOF code, it should be the IDs from the enzo dataset,
> just like the IDs from a run of yt HOP. I never did extensive testing on yt
> FOF so it's possible there is a bug. Have you checked against the raw enzo
> data to see which is correct?
>
> Thanks for digging into this stuff, by the way!
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ <http://physics.ucsd.edu/%7Esskory/> _.>/
> _Graduate Student
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