yt-users May 2021

yt-users@python.org

5 participants
6 discussions

refining rockstar-galaxies halo minimum mass

by C Bernhardt

Dear yt and rockstar users, I recently installed the newest version of rockstar-galaxies as I had been using a much older version. Although the output reports a particle mass of 1.31418e+05 Msun/h, I don't see any halos smaller than 1e+08 Msun/h. I was expecting to get the minimum masses an order of magnitude lower. I see in the config includes MIN_HALO_OUTPUT_SIZE = 25, set as a default. I tried to change this parameter to 10 and restart from the beginning, but I run rockstar within yt with RockstarHaloFinder ( yt.extensions.astro_analysis.halo_finding.rockstar.api), but my config file was overwritten by the defaults. Is this even the right approach? If so, how do I restart rockstar (more detailed than just rh.run(restart=True), please) with customized parameters within yt's RockstarHaloFinder? Thanks in advance, -- Carla Bernhardt PhD Student Universität Heidelberg ZAH Institut für Theoretische Astrophysik

4 months

Registering external data as a Field of an existing dataset?

by Matthew Abruzzo

Hello, I wanted to ask if yt supports the registration of external data as a field of an existing dataset. In case it helps clarify my question, I just wanted to briefly elaborate on what I'm looking to do. I'm trying to characterize the turbulent velocities in some high resolution unigrid simulations. Because this involves convolution, I need to compute the turbulent velocity outside of the yt infrastructure (this seems beyond the scope of what a user-defined derived field can support). It would be convenient to be able to load the results back into yt to use the existing analysis machinery (e.g. for phase plots and slices). I have thought about using the "Generic Unigrid Data" frontend, but the simulation's size unfortunately makes that approach somewhat intractable. I'm pretty confident that the answer to my question is "no," but I wanted to be sure before I rolled my own solution. Thank you for your help. Best, Matthew Abruzzo

4 months, 2 weeks

Important NUMFocus Survey -- Please fill it out!

by Stephanie Tonnesen

Dear yt-ers, yt is participating in a research project being conducted by NumFOCUS <https://numfocus.org/>. The research is looking into understanding the diversity, inclusion and barriers to participation within NumFOCUS-sponsored projects and the wider open source community. The survey <https://numfocus.typeform.com/to/W6Bax8eq> will take 15-20 min to complete. We’d appreciate your contribution by June 8, 2021. The results of this survey will help NumFOCUS work closely with our projects to develop practices that will lead to project success around diversity, inclusion and sustainability. Click here to participate into the survey <https://numfocus.typeform.com/to/W6Bax8eq> Thank you in advance for your participation! Stephanie Tonnesen (for the yt steering committee) -- Dr. Stephanie Tonnesen Associate Research Scientist CCA, Flatiron Institute New York, NY stonnes(a)gmail.com

4 months, 2 weeks

Create a 3D fixed resolution buffer from 3D AMR data

by Tseng, Po-Hsun

Dear all, How to create a 3D fixed resolution buffer (FRB) from 3D AMR data? More specifically, if we would like to project 3D AMR data onto a 2D plane with fixed resolution, we can do something like below: proj = ds.proj(...) frb = proj.to_frb(...) plt.imshow(np.array(frb['density'])) However, if I understand correctly, the array `frb` stores 2D projected data instead of the original 3D data with fixed resolution, correct? How do I do that?. Thanks.

4 months, 3 weeks

Particle Bounds

by Zhang Meng

Hello All, I'm trying to find halos in mutiple snapshot files from DM-only cosmological simulation generated by Gadget-2, using FOF halo finder in yt. The box size of the simulation is 13.8Mpc/h and contain 1024^3 particles. Here is my code, data_ds = yt.load('./snapshot_016.0') hc = HaloCatalog(data_ds=data_ds, finder_method='fof',finder_kwargs={"dm_only":False,"ptype":"Halo"}) hc.create() and I met the error like this, yt.utilities.exceptions.YTDomainOverflow: Particle bounds (-386.63174, -385.38947, -525.52057) and (6900.443, 6900.271, 13799.999) exceed domain bounds [0. 0. 0.] code_length and [13800. 13800. 13800.] code_length. I have already updated yt and it's dependecy to the version 3.6.1, but I still have this problem. It seems like yt treat the particle velocity as the bound, I have no idea. What make me more confusing is there is no such error when I run above code for another small scale simualtion (886^3 particles and L_box=12Mpc/h), So, does anyone know what happend here or has ever met the same problem?

5 months

Save The Dates!

by Stephanie Tonnesen

Hi yt-users, This is a quick note to ask you to save some time during the weeks of *June 7-11* and *August 2-6 *this year! We are going to try and push through PRs those weeks, with each week having its own theme! I hope that everyone can make both (meaning be active on slack and engaged in PRs)!! We will be sending out details with our vision for each week shortly. Mischief Managing week (we solemnly swear to be up to *only* good!) We will have a managing mischief week to focus on cleaning up the codebase. This is when we want dead code, code styling, and other PRs both submitted and merged. MM week will be on June 7-11 this year. PR Mentorship Week This is a week that we will help get older PRs and PRs from new contributors across the finish line. PRs from new contributors are always welcome; this week is specifically for extra focused time to boost the work of new contributors. This will include dedicated time from the development community on taking over PRs or mentoring newer contributors whose PRs have been waiting a while. PR Mentorship week will be held on August 2-6 this year. Can't wait to "see" you! -The yt steering committee -- Dr. Stephanie Tonnesen Associate Research Scientist CCA, Flatiron Institute New York, NY stonnes(a)gmail.com

5 months, 2 weeks

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yt-users May 2021