yt-users May 2016

yt-users@python.org

25 participants
37 discussions

by david collins

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.

7 months, 3 weeks

Problem when run yt dev in parallel on Blue Waters

by Pengfei Chen

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

4 years, 3 months

Problem using covering_grid as data_source for the photon_simulator

by Markus Haider

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

4 years, 5 months

Loading ASCII VTK data

by Lukas Bystricky

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

4 years, 6 months

Load in ASCII VTK

by Lukas Bystricky

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

4 years, 6 months

Periodicity

by David Collins

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.

4 years, 6 months

Bug in HaloMassFcn output units?

by Io Odderskov

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 -------------- >

4 years, 6 months

light ray woes

by Stephanie Tonnesen

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

4 years, 6 months

error while submitting development queue job to STAMPEDE supercomputer

by turhan nasri

Hi people, though I am not sure if this is the right place to ask this, but I have submitted a development queue job to STAMPEDE supercomputer and I was using yt toolkit in my script, I got the following error after around half an hour of running the job. [c557-702.stampede.tacc.utexas.edu:mpispawn_0][child_handler] MPI process (rank: 0, pid: 26868) terminated with signal 9 -> abort job [c557-702.stampede.tacc.utexas.edu:mpirun_rsh][process_mpispawn_connection] mpispawn_0 from node c557-702 aborted: MPI process error (1) TACC: MPI job exited with code: 1 can anyone please shed light on the error here? with the development queue the maximum code runtime is 2 hours. thanks in advance. -Turhan

4 years, 6 months

tilting disk issues

by Stephanie Tonnesen

Hi all, I am simulating a single idealized galaxy and select a disk region to get the rotational velocity (see attached code below). My problem is that changing my angular momentum vector doesn't change the velocity profile! Can anyone tell me what is going on here? Thanks, Stephanie -- Dr. Stephanie Tonnesen Alvin E. Nashman Postdoctoral Fellow Carnegie Observatories, Pasadena, CA stonnes(a)gmail.com

4 years, 6 months

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yt-users May 2016