I've opened a pull request to fix the issue you discovered with magnetic units:

https://bitbucket.org/yt_analysis/yt/pull-requests/2213

I'd appreciate it if one of you could give it a test. Let me know if you have questions about how to pull a pull request in locally with mercurial.

I haven't had a time to look at the issue you were having with the 'all' particle union, but I have it on my list to look at it.

On Fri, May 27, 2016 at 2:37 AM, Huebl, Axel <a.huebl@hzdr.de> wrote:
Dear Nathan and John,

thank you for the quick answers.

Yes, the resources to reproduce the questions are:

Repo:
  https://bitbucket.org/C0nsultant/openpmd/src?at=yt

Example Files:
  PIConGPU > 2D3V > one of the .h5 files
  https://owncloud.hzdr.de/index.php/s/ouisGZe5M0wCVzj
  password: openPMD

Example script (attached, like last mail).


Axel

On 24.05.2016 18:37, Nathan Goldbaum wrote:
>
>
> On Tue, May 24, 2016 at 11:30 AM, Huebl, Axel <a.huebl@hzdr.de
> <mailto:a.huebl@hzdr.de>> wrote:
>
>     Hi yt-devs,
>
>     I am forwarding this conversation to the public list to keep it open for
>     others to join in and to build up a record that might help others.
>
>     Our new student Fabian updated our frontend and implemented particle
>     readers. Unfortunately some details of the particle "fields" still cause
>     some bumps that we can not get our head around.
>
>     We are now able to read fields and particles, even chunk-wise, and can
>     work with the data we read in python scripts via the all_data() method.
>
>     Nevertheless, using the particle scatter plots such as yt.ParticlePlot
>     seems not to work. We have some problems with unions / the "all" group
>     and the fact that we have several particle species (e.g., "hot
>     electrons", "cold electrons", "helium ions", "nitrogen ions", etc.)
>
>
> The 'all' particle union should get set up automatically, but maybe
> something is going wrong with that machinery.
>
> Can you create a test script that illustrates this issue using a
> publicly available OpenPMD dataset?
>
>
>
>     Also since the last rebase: did someone recently change the unit system
>     in yt? T for "Tesla" seems not to be understood any more. Is there a
>     changelog somewhere available? Do we have to describe our data in
>     cgs / mks?
>
>
> I just double-checked, and Tesla should be working:
>
> In [1]: from yt import YTQuantity
>
> In [2]: YTQuantity(1, 'T')
> Out[2]: 1.0 T
>
> In [3]: YTQuantity(1, 'T').to_equivalent('G', 'CGS')
> Out[3]: 10000.0 G
>
> Can you explain a little bit more what issue you're having? A test
> script that illustrates the issue would also help.
>
>
>     Would someone be interested for a quick heads up via e.g., skype /
>     web-rtc so we can ask specific questions?
>
>     Fabian is around on Tuesdays and Fridays, something like early CA time,
>     and late GER time usually works great (e.g., 9pm-PDT / 6pm-CEST).
>
>     Our current branch HEAD can be found here (->yt->frontends->openPMD):
>       https://bitbucket.org/C0nsultant/openpmd/src?at=yt
>
>     And an example script is attached.
>
>
>     Thanks a lot!
>     Axel
>
>

--

Axel Huebl
Phone +49 351 260 3582
https://www.hzdr.de/crp
Computational Radiation Physics
Laser Particle Acceleration Division
Helmholtz-Zentrum Dresden - Rossendorf e.V.

Bautzner Landstrasse 400, 01328 Dresden
POB 510119, D-01314 Dresden
Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey
          Prof. Dr.Dr.h.c. P. Joehnk
VR 1693 beim Amtsgericht Dresden

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