Hi Andrew,

I'm happy to help out with this. I have a number of possible solutions, so I suggest we take this discussion to the #ytree channel on the yt slack.


On Fri, Jul 17, 2020 at 5:30 AM Andrew Emerick <aemerick11@gmail.com> wrote:
Hi all,

This is my first foray into doing halo finding / merger tree analysis so forgive me if I'm just missing something simple. My goal is to be able to identify a halo at lower-z that had specific properties at higher-z so I can get its lagrangian volume at lower-z to build a nested zoom. (And I'm assuming merger trees are the only / best way to identify the halo across snapshots for this).

Anyway, I've been following the docs for yt_astro_analysis to build halo catalogs for a series of datasets and just tried the example in treefarm to build a merger tree, but I get an error. I'm using the last_yt3 changeset of yt, am on the master branch of treefarm, and halos were generated using rockstar-galaxies via master branch of yt_astro_analysis. And the datasets are DM-only Enzo runs.

I get this error: http://paste.yt-project.org/show/256/

When running this (slightly modified from the example code): 


Thanks for the help!!

Pasadena Fellow in Theoretical Astrophysics
Carnegie Observatories
California Institute of Technology
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