[yt-users] yt-hop: particle IDs question

[Michele Trenti]

Hi Stephen,

Thank you very much for your reply! I apologize if I was not clear in my 
mail.

I am not interested in using fastBuildMerge.py, I am only looking for 
a list of particles IDs associated to each halo. I have my own code to 
track mergers.

If you can point me to where this information is saved by yt-hop it would 
be very helpful.

Thanks again,

Michele

Michele Trenti
Center for Astrophysics and Space Astronomy
University of Colorado
389 UCB                               Phone: +1 303-492-8490
Boulder, Colorado 80309-0389            Fax: +1 303-492-7178
USA                                  E-mail: michele.trenti at colorado.edu


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On Wed, 13 May 2009, Stephen Skory wrote:

>
> Hi Michele,
>
>
>> I am a new user of yt and I trying to run the yt-hop Halo Finder to build a
>> merger history of halos.
>
> Yes, it is possible.  You need to be running out of trunk.
>
> The first step is to make a copy of 'examples/fastBuildMerge.py' to your favorite location. This is a Python script that builds a Python script that will drive yt. Got it? Good.
>
> In your copy of fastBuildMerge.py, edit the values at the top. It's heavily commented, so I hope you will be able to understand what each does. Reply to the list if you need help understanding them.
>
> You'll want to run HOP on the last (z=0?) timestep by hand to find the halo(es) you wish to track back in time, but it sounds like you've already done that.
>
> Run Python on this script, which outputs the actual script that drives yt. Run the new script and you should get the merger tree.
>
> One final note: as I responded to your email, I noticed I had a typo in the trunk version of fastBuildMerge, which I've updated in r1305, so you should 'svn up' before starting.
>
>
> Good luck!
> _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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