[yt-users] Re: Merger trees

19 Nov 2018

      Britton,

How would I install Rockstar for yt to use? Your webpage mentions 
install-script.sh, but my from-source installation lacks it:

~/ART/yt >ls
appveyor.yml  CONTRIBUTING.rst  MANIFEST.in  setup.cfg    yt.egg-info
benchmarks    COPYING.txt       nose.cfg     setupext.py
build         CREDITS           __pycache__  setup.py
CITATION      doc               README.md    tests
clean.sh      docker            scripts      yt

I downloaded it as the help recommends, but then the script tries to 
download and install yet another yt installation.

I need to use my clone, since I made some changes to it that I haven't 
yet submitted in a pull request.

On 10/5/2018 12:23 PM, Britton Smith wrote:
...
Hi Nick,
Ok, good luck. It should be noted that the version of Rockstar that runs 
with yt is not the latest version of Rockstar, known as 
Rockstar-Galaxies. yt's Rockstar does not support multi-mass 
simulations. You may also find different i/o performance between the two 
versions, so it's worth experimenting, if both options are available.
Britton
On Fri, Oct 5, 2018 at 10:10 AM Nick Gnedin mailto:gnedin@fnal.gov> wrote:
Britton,
Thank you very much, I will try Rockstar first.
n
On 10/5/2018 7:06 PM, Britton Smith wrote:
     > HI Nick,
     >
     > Sadly, yt's FoF and HOP finders don't output member particle
    information
     > for the halos, so it might not be possible to use those catalogs
    to make
     > merger trees. ytree's merger-tree creation works with FoF catalogs
     > generated by the inline Gadget halo finder, for which yt supports
     > extracting member particle information. If you're looking to make
     > merger-trees, the best route currently is probably
     > Rockstar/consistent-trees, the outputs of which can be loaded by
    ytree.
     >
     > It is probably a week's worth of work to fix up yt's HOP/FoF
    finders to
     > output particle information and then to add support for loading that
     > into yt.
     >
     > Britton
     >
     > On Fri, Oct 5, 2018 at 6:07 AM Nick Gnedin mailto:gnedin@fnal.gov
     > mailto:gnedin@fnal.gov>> wrote:
     >
     >
     >     Folks,
     >
     >     I am confused about how to compute merger trees with yt.
    Documentation
     >   
      (https://yt-project.org/doc/analyzing/analysis_modules/halo_merger_tree.html?... https://urldefense.proofpoint.com/v2/url?u=https-3A__yt-2Dproject.org_doc_analyzing_analysis-5Fmodules_halo-5Fmerger-5Ftree.html-3Fhighlight-3Dmerger-2520tree&d=DwMFaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=7jSLZBQB_2gqGQ3elA922w&m=ln3f04sr7kK9aACk-8EcI3uMd-86E1rnTd5rJ2BW5bg&s=JJEEm3ckzl6tozYzLjLZC1jZ2haYyYXfmwlk8jQHsFQ&e=
     >   
      https://urldefense.proofpoint.com/v2/url?u=https-3A__yt-2Dproject.org_doc_analyzing_analysis-5Fmodules_halo-5Fmerger-5Ftree.html-3Fhighlight-3Dmerger-2520tree&d=DwMFaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=7jSLZBQB_2gqGQ3elA922w&m=zeRRll5QvyPrOQIZHiEPcx7nJk84AGxCHVY_xIV4OZ8&s=JcesVppFFSFwh2Hj4CdmDhGC6m2PJwj6igNfcC-vblA&e=)
     >
     >     refers to ytree package, but that package documentation seems to
     >     indicate that only FoF or Subfind halo catalogs can be
    converted into a
     >     merger tree, while the halo finder in yt is HOP.
     >
     >     I have run HOP for several snapshots from a simulation. What
    would you
     >     recommend to use to make a merger tree from such a data set?
     >
     >     Thank you,
     >
     >     Nick Gnedin
     >
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