[yt-users] cannot find some particle fields

[Jean-Claude Passy]

Hi Matt,

thanks for your quick reply.
It only gives me the gas fields:

-----------------------------
In [5]: pf.h.field_list
Out[5]: ['z-velocity', 'y-velocity', 'x-velocity', 'TotalEnergy', 'Density']
-----------------------------

Btw, I am using the latest dev version of yt (changeset 7439:34b95297062b).
Cheers,

JC


On Apr 24, 2013, at 7:52 AM, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi JC,
> 
> What's the output of:
> 
> pf.h.field_list
> 
> ?
> 
> -Matt
> 
> On Wed, Apr 24, 2013 at 12:35 AM, Jean-Claude Passy <jcpassy at gmail.com> wrote:
>> Hi all,
>> 
>> sorry, I have a pretty dumb question.
>> I have a non-cosmological simulation with only 1 particle. I can get the
>> particle_mass field, but yt throws the following error when I try to grab
>> particle_index:
>> 
>> ---------------------------------------------------------------------------------------------------------------------------------
>> In [1]: pf = load('CE0001')
>> yt : [INFO     ] 2013-04-24 00:32:02,190 Parameters: current_time
>> = 0.00149998503444
>> yt : [INFO     ] 2013-04-24 00:32:02,190 Parameters: domain_dimensions
>> = [32 32 32]
>> yt : [INFO     ] 2013-04-24 00:32:02,190 Parameters: domain_left_edge
>> = [ 0.  0.  0.]
>> yt : [INFO     ] 2013-04-24 00:32:02,190 Parameters: domain_right_edge
>> = [ 1.  1.  1.]
>> yt : [INFO     ] 2013-04-24 00:32:02,191 Parameters: cosmological_simulation
>> = 0.0
>> 
>> In [2]: region = pf.h.region([0.5, 0.5, 0.5], [0.0, 0.0, 0.0], [1.0, 1.0,
>> 1.0])
>> yt : [INFO     ] 2013-04-24 00:32:05,802 Getting the binary hierarchy
>> yt : [INFO     ] 2013-04-24 00:32:05,805 Finished with binary hierarchy
>> reading
>> 
>> In [3]: region['particle_mass']
>> yt : [INFO     ] 2013-04-24 00:32:12,685 Getting particle_mass using
>> ParticleIO
>> Out[3]: array([ 6585896.1408])
>> 
>> In [4]: region['particle_index']
>> ---------------------------------------------------------------------------
>> KeyError                                  Traceback (most recent call last)
>> /Users/jcpassy/Work/yt-x86_64/src/yt-hg/scripts/iyt in <module>()
>> ----> 1 region['particle_index']
>> 
>> /Users/jcpassy/Work/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc
>> in __getitem__(self, key)
>>    328             if key not in self.fields:
>>    329                 self.fields.append(key)
>> --> 330             self.get_data(key)
>>    331         return self.field_data[key]
>>    332
>> 
>> /Users/jcpassy/Work/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc
>> in get_data(self, fields, in_grids, force_particle_read)
>>   2614                     pass
>>   2615             if field not in self.hierarchy.field_list and not
>> in_grids:
>> -> 2616                 if self._generate_field(field):
>>   2617                     continue # True means we already assigned it
>>   2618             mylog.info("Getting field %s from %s", field,
>> len(self._grids))
>> 
>> /Users/jcpassy/Work/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc
>> in _generate_field(self, field)
>>    361                 return True
>>    362         else: # Can't find the field, try as it might
>> --> 363             raise KeyError(field)
>>    364
>>    365     def _generate_field_in_grids(self, field, num_ghost_zones=0):
>> 
>> KeyError: 'particle_index'
>> ---------------------------------------------------------------------------------------------------------------------------------
>> 
>> However, the field is there:
>> 
>> ---------------------------------------------------------------------------------------------------------------------------------
>> [ 0:30:13] Obiwan:$ h5ls CE0001.cpu0000/Grid00000004
>> Dark_Matter_Density      Dataset {52, 52, 52}
>> Density                  Dataset {52, 52, 52}
>> TotalEnergy              Dataset {52, 52, 52}
>> particle_index           Dataset {1}
>> particle_mass            Dataset {1}
>> particle_position_x      Dataset {1}
>> particle_position_y      Dataset {1}
>> particle_position_z      Dataset {1}
>> particle_type            Dataset {1}
>> particle_velocity_x      Dataset {1}
>> particle_velocity_y      Dataset {1}
>> particle_velocity_z      Dataset {1}
>> x-velocity               Dataset {52, 52, 52}
>> y-velocity               Dataset {52, 52, 52}
>> z-velocity               Dataset {52, 52, 52}
>> [ 0:30:13] Obiwan:$ h5ls -d CE0001.cpu0000/Grid00000004/particle_index
>> particle_index           Dataset {1}
>>    Data:
>>        (0) 0
>> ---------------------------------------------------------------------------------------------------------------------------------
>> 
>> Am I missing something obvious?
>> 
>> Thanks a lot for you help,
>> 
>> JC
>> 
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>> yt-users at lists.spacepope.org
>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>> 
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