[yt-users] Dark Sky Simulations, analysis gone wrong.

[ALEXANDROS TSOUROS]

Thanks for your prompt reply!

So this is another problem. I'm using a 64-bit python installation, yet 
the output of 'print ds.file_list' is

"
(...)
Traceback (most recent call last):
   File "ds.py", line 5, in <module>
     print ds.field_list
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/data_objects/static_output.py", 
line 545, in field_list
     return self.index.field_list
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/data_objects/static_output.py", 
line 503, in index
     self, dataset_type=self.dataset_type)
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/geometry/particle_geometry_handler.py", 
line 39, in __init__
     super(ParticleIndex, self).__init__(ds, dataset_type)
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/geometry/geometry_handler.py", 
line 50, in __init__
     self._setup_geometry()
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/geometry/particle_geometry_handler.py", 
line 50, in _setup_geometry
     self._initialize_particle_handler()
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/geometry/particle_geometry_handler.py", 
line 104, in _initialize_particle_handler
     self._initialize_indices()
   File 
"/home/atsouros/gadget2/yt/yt-conda/src/yt-git/yt/geometry/particle_geometry_handler.py", 
line 126, in _initialize_indices
     morton = np.empty(self.total_particles, dtype="uint64")
MemoryError
"

I would assume that the problem is that it's running out of ram. In 
general, I am able to produce the examples provided by Dark Sky, so I 
can in general load data from the dataset. But I cannot use 'print 
ds.field_list'.

TL;DR

The output is 'MemoryError'.



On 2017-07-02 01:34, Nathan Goldbaum wrote:
> What's the output of "print(ds.field_list)" with the loaded dataset?
> 
> On Sat, Jul 1, 2017 at 4:21 PM ALEXANDROS TSOUROS
> <ph4602 at edu.physics.uoc.gr> wrote:
> 
>> Hello all!
>> 
>> I am quite new to yt, so please bear with my ignorance!
>> 
>> I need to perform analysis on the open data of the Dark Sky
>> Simulation
>> (http://darksky.slac.stanford.edu). In particular I need to create 1
>> dimensional profiles of the radial velocity of dark matter particles
>> around halos.
>> 
>> Attached, you'll find my attempt at producing such a profile.
>> 
>> When I do this on a GADGET2 simulation I've run, I can use the
>> 'radial_velocity' field without a problem. However, this script,
>> where
>> the data is that of the Dark Sky simulation, produces the following
>> output :
>> 
>> '
>> (...)
>> yt.utilities.exceptions.YTFieldNotFound: Could not find field
>> '('all',
>> 'radial_velocity')' in ds14_a_1.0000.'
>> 
>> However, as I understand it, the field 'radial_velocity' is native
>> to
>> yt. How can I surpass this problem?
>> 
>> Any help will be appreciated.
>> 
>> Thank you very much for your time,
>> Tsouros Alexandros
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