yt-users May 2016

yt-users@python.org

25 participants
39 discussions

Porting .ply files to Blender with colors?
by Jill P. Naiman 14 Aug '22

14 Aug '22

Hi All, I was curious if anyone has had any luck porting .ply files generated with yt into Blender with colors? It seems to port in the surfaces just fine, but they are a uniform color. From what I can gather, Blender imports .ply files with face color instead of vertex so I tried the surf.export_ply routine with "face" instead of "vertex" for sample_type, but no luck ("vertex" doesn't work either). Let me know if I can provide any more useful info. Thanks for any help, -J

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Stars on volume rendering
by Elizabeth Harper-Clark 11 Dec '21

11 Dec '21

Hi all, Thanks for all your help over the last couple of days. One more question: - Can I plot particles on a volume rendered image? I have stars and I want to show where they are! Thanks, Libby -- Elizabeth Harper-Clark MA MSci PhD Candidate, Canadian Institute for Theoretical Astrophysics, UofT Sciences and Engineering Coordinator, Teaching Assistants' Training Program, UofT www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark> h-clark(a)cita.utoronto.ca Astronomy office phone: +1-416-978-5759

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Variance in phase/profiles
by david collins 11 Apr '20

11 Apr '20

Hi, Everybody! Does anyone out there have a technique for getting the variance out of a profile object? A profile object is good at getting <X> vs. B, I'd then like to get < (X - <X>)^2 > vs B. Matt and I had spittballed the possibility some time ago, but I was wondering if anyone out there had successfully done it. Thanks, d. -- Sent from my computer.

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Problem when run yt dev in parallel on Blue Waters
by Pengfei Chen 22 Aug '16

22 Aug '16

Hi all, I have trouble running yt in parallel on Blue Waters. I installed yt using miniconda, the version of yt is ~/miniconda/lib $yt version yt module located at: /u/sciteam/madcpf/miniconda/lib/python2.7/site-packages/yt-3.3.dev0-py2.7-linux-x86_64.egg The current version and changeset for the code is: --- Version = 3.3-dev Changeset = 90f900be7a36+ yt Then with miniconda/bin in PATH I installed mpi4py-2.0.0. But when I tried to make the following simple output in parallel, I get: import yt yt.enable_parallelism() from yt.utilities.parallel_tools.parallel_analysis_interface import\ parallel_objects, communication_system comm = communication_system.communicators[-1] print comm.rank, comm.size 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 ... When I run a similar code but with yt-2.x also on Blue Waters, I get what I expect: 7 16 15 16 6 16 9 16 11 16 8 16 0 16 4 16 ... I'm confused about it. Could anyone give me some suggestions please? Thanks, Pengfei

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Problem using covering_grid as data_source for the photon_simulator
by Markus Haider 14 Jun '16

14 Jun '16

Hi, I wanted to use the photon simulator for mock x-ray observations on single cells and line of sights using single cells. For this I wanted to select the cells using covering_grid, but then I get the following error: photon_simulator.py is doing delta_min, delta_max = data_source.quantities.extrema("d%s"%ax) and the result is YTDataSelectorNotImplemented: Data selector 'covering_grid' not implemented. But maybe covering_grid is not the right thing for what I had in mind, how would you select the cells to pass as data_source to the photon simulator? Cheers, Markus

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Loading ASCII VTK data
by Lukas Bystricky 02 Jun '16

02 Jun '16

Hi all, I'm trying to load in some data from an ASCII VTK file (attached for reference) that I created following the guidelines here: http://www.vtk.org/wp-content/uploads/2015/04/file-formats.pdf. I can load this file into Visit and I was hoping that to load it into yt would be as simple as : ds = yt.load("lid_driven_cavity_20.vtk") When I try that however I get the error message: Traceback (most recent call last): File "visualization.py", line 3, in <module> ds = yt.load("lid_driven_cavity_20.vtk") File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\convenience.py", line 84, in load return candidates[0](*args, **kwargs) File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py", line 470, in __init__ Dataset.__init__(self, filename, dataset_type, units_override=units_override) File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\data_objects\static_output.py", line 190, in __init__ self._parse_parameter_file() File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py", line 528, in _parse_parameter_file self.domain_left_edge = grid['left_edge'] KeyError: 'left_edge' Is it possible to load in such a file to yt? If not, since I'm writing my own data file, how could I edit it to make it readable by yt? Thanks in advance, Lukas

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Load in ASCII VTK
by Lukas Bystricky 31 May '16

31 May '16

Hello all, This is a followup to my question here ( http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2016-May/007830…). Apologies, but I can't seem to figure out how to reply since I was never sent an e-mail for either my question or Nathan's response. I'm trying to load a legacy VTK file into YT (see format description http://www.vtk.org/wp-content/uploads/2015/04/file-formats.pdf), but I when I try: ds = yt.load("file.vtk") I get the error: traceback (most recent call last): File "visualization.py", line 3, in <module> ds = yt.load("file.vtk") File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\convenience.py", line 84, in load return candidates[0](*args, **kwargs) File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py", line 470, in __init__ Dataset.__init__(self, filename, dataset_type, units_override=units_override) File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\data_objects\static_output.py", line 190, in __init__ self._parse_parameter_file() File "C:\Users\Dave\Anaconda2\lib\site-packages\yt\frontends\athena\data_structures.py", line 528, in _parse_parameter_file self.domain_left_edge = grid['left_edge'] KeyError: 'left_edge' Nathan Goldbaum pointed out is his answer that YT can read in VTK files from Athena. I looked into this and it seems like the difference between my file and Athena's files is that mine are ASCII while Athena's are binary. Is that right? On another note, Nathan also pointed out there are people working on a frontend for the VTK format I'm using. Could I provide any help there? Thanks again, and sorry for the double posting. Lukas

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Periodicity
by David Collins 31 May '16

31 May '16

Hi, Everybody-- I just got the following error: """ RuntimeError: Error: yt attempted to read outside the boundaries of a non-periodic domain along dimension 0. Region left edge = -0.0625 code_length, Region right edge = 1.0625 code_length Dataset left edge = 0.0 code_length, Dataset right edge = 1.0 code_length This commonly happens when trying to compute ghost cells up to the domain boundary. Two possible solutions are to load a smaller region that does not border the edge or override the periodicity for this dataset. """ This is awesome. I did what it suggested and it worked. Whoever wrote this error is awesome. Thanks a ton! That's all. d. -- -- Sent from a computer.

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Bug in HaloMassFcn output units?
by Io Odderskov 30 May '16

30 May '16

Dear Yt users. Last week I asked a question about the function HaloMassFcn, as I can't get the fitting function it produces to match the data from the Halo Finder Comparison Project and from the DEUS simulations. After chatting with Nathan Goldbaum about the problem (here and on IRC), I still haven't found an explanation. The only possible explanation I have come up with so far is that there is a bug in the unit handling in HaloMassFcn, so that the masses of the fitting function is output in Msun/h**2, rather than Msun as it should -- this would explain why I need to divide the masses by h (which I set to 0.7) to match the data, which uses Msun/h as their mass-unit. However, it is entirely possible that I have simply misunderstood something, I just really can't figure out what it is. Here is the script where I'm plotting the fitting function from HaloMassFcn, and comparing it to data from the Halo Finder Comparison project (https://arxiv.org/pdf/1104.0949v1.pdf) and from on of the DEUS simulations (http://www.deus-consortium.org/deuvo/#download), as well as the resulting plot: script: http://paste.yt-project.org/show/6530/ image http://imgur.com/otWW3QJ I'm using this version of yt: Version = 3.2.3 Changeset = bdea84d95099 (stable) @ I'm also filing a bug on this issue: https://bitbucket.org/yt_analysis/yt/issues/1228/bug-in-halomassfcn-output-… Best regards, Io. > Message: 1 > Date: Mon, 23 May 2016 22:43:09 +0200 > From: Io Odderskov <io.odderskov(a)gmail.com> > To: yt-users(a)lists.spacepope.org > Subject: [yt-users] HaloMassFunction > Message-ID: > < > CAC0EgOA-tpD5-0nZY9Ssyyh94zhRcXm1vYM6suyOzkucgOAjqg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Dear Yt-users. > > I have just started used Yt, which I find to be very useful. However, I am > having trouble converting the units of the output of the > HaloMassFcn-function to match other data sets. > > I have tried comparing the Tinker 2008 fitting function produced by > HaloMassFcn to the halo mass function from the Halo Finder Comparison > Project (https://arxiv.org/pdf/1104.0949v1.pdf) and to a halo catalogue > from the DEUS consortium (http://www.deus-consortium.org/deuvo/#download). > In these cases, the halo masses are given in Msun/h, and the cumulative > halo number density in h^3/Mpc^3. According to the Yt-documentation, the > masses output by the HaloMassFcn-function should be in Msun, and the number > densities in 1/Mpc^3. To convert to Msun/h and h^3/Mpc^3, I multiply the > masses by h, and divide the number densities with h^3. In the attached > figure, this corresponds to the line labelled "Tinker2008 - masses > multiplied by h", which does not match the other data sets very well. If I > instead divide the masses by h, I get the line labelled Tinker2008 - masses > divided by h", which looks much better. But I really can't see how to > justify this conversion. > > I hope you can help me figure out what I'm doing wrong :-) > Thanks in advance! > > Best regards, Io. > > script: http://paste.yt-project.org/show/6530/ > image http://imgur.com/otWW3QJ > > version: > > Version = 3.2.3 > Changeset = bdea84d95099 (stable) @ > > P.S. When I tried to do "yt upload_image", I got a 404 error. Perhaps imgur > changed their API? > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.spacepope.org/pipermail/yt-users-spacepope.org/attachments/201… > > > > ------------------------------ > > Message: 2 > Date: Mon, 23 May 2016 15:51:20 -0500 > From: Nathan Goldbaum <nathan12343(a)gmail.com> > To: Discussion of the yt analysis package > <yt-users(a)lists.spacepope.org> > Subject: Re: [yt-users] HaloMassFunction > Message-ID: > <CAJXewOn9Eq5f6j_xdJJ-du6it1g4aaAOMiBiz= > 0-4sifsupk2w(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > On Mon, May 23, 2016 at 3:43 PM, Io Odderskov <io.odderskov(a)gmail.com> > wrote: > > > Dear Yt-users. > > > > I have just started used Yt, which I find to be very useful. However, I > am > > having trouble converting the units of the output of the > > HaloMassFcn-function to match other data sets. > > > > I have tried comparing the Tinker 2008 fitting function produced by > > HaloMassFcn to the halo mass function from the Halo Finder Comparison > > Project (https://arxiv.org/pdf/1104.0949v1.pdf) and to a halo catalogue > > from the DEUS consortium (http://www.deus-consortium.org/deuvo/#download > ). > > In these cases, the halo masses are given in Msun/h, and the cumulative > > halo number density in h^3/Mpc^3. According to the Yt-documentation, the > > masses output by the HaloMassFcn-function should be in Msun, and the > number > > densities in 1/Mpc^3. To convert to Msun/h and h^3/Mpc^3, I multiply the > > masses by h, and divide the number densities with h^3. In the attached > > figure, this corresponds to the line labelled "Tinker2008 - masses > > multiplied by h", which does not match the other data sets very well. If > I > > instead divide the masses by h, I get the line labelled Tinker2008 - > masses > > divided by h", which looks much better. But I really can't see how to > > justify this conversion. > > > > To convert to Msun/h, you're trying to multiply by h? I don't think that's > right --- dividing by h is the correct thing to do. > > > > > > I hope you can help me figure out what I'm doing wrong :-) > > Thanks in advance! > > > > Best regards, Io. > > > > script: http://paste.yt-project.org/show/6530/ > > image http://imgur.com/otWW3QJ > > > > version: > > > > Version = 3.2.3 > > Changeset = bdea84d95099 (stable) @ > > > > P.S. When I tried to do "yt upload_image", I got a 404 error. Perhaps > > imgur changed their API? > > > > Yeah, imgur changed their API. This is fixed in the development branch of > yt but hasn't been backported to the stable branch. Perhaps we should do a > 3.2.4 release given than 3.3 is taking a bit longer than anticipated to > release. > > > > > > _______________________________________________ > > yt-users mailing list > > yt-users(a)lists.spacepope.org > > http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org > > > > > -------------- next part -------------- >

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light ray woes
by Stephanie Tonnesen 29 May '16

29 May '16

Hi all, I am trying to make a light ray using a few redshift outputs from z=0.4 to z=0.1. Right now I just have two commands in my code taken basically directly from the docs: lr = LightRay("CBOX.enzo",simulation_type="Enzo",near_redshift=0.1, far_redshift=0.4,time_data=False,redshift_data=True,find_outputs=True) lr.make_light_ray(seed=8934876,fields=['temperature','density','velocity'],use_peculiar_velocity=True) My current problem is that the first command "LightRay" doesn't seem to be using any of my outputs between 0.4 and 0.1! I am attaching the error file, and you can see that it finds 9 outputs, 7 of which are between and including 0.4 to 0.1. However, then it claims that I am asking it to go straight from 0.399996 to 0.1. I do only have redshift dumps to work with, but I think that those should be used since redshift_data=True Does anyone have any advice for making this work? Thanks, Stephanie -- Dr. Stephanie Tonnesen Alvin E. Nashman Postdoctoral Fellow Carnegie Observatories, Pasadena, CA stonnes(a)gmail.com

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