[yt-users] problem with processing BoxLib data in pure hydro case

[Wolfram Schmidt]

Hi,

I encountered a problem when processing BoxLib (Nyx) data from pure 
hydro simulations without particles, using an Anaconda installation of yt.

After loading a dataset with yt.load(), I get the following error for 
ds.field_list:

---------------------------------------------------------------------------
KeyError                                   Traceback (most recent call last)
<ipython-input-5-5aaf470c0415>  in<module>() ----> 
1ds.field_list/sw/tools/anaconda3/4.1.1/generic/lib/python3.5/site-packages/yt/data_objects/static_output.py 
in field_list(self) 459 @property460 def field_list(self):--> 461return 
self.index.field_list462 463 def 
create_field_info(self):/sw/tools/anaconda3/4.1.1/generic/lib/python3.5/site-packages/yt/data_objects/static_output.py 
in index(self) 417 raise RuntimeError("You should not instantiate 
Dataset.")418 self._instantiated_index = self._index_class( --> 419self, 
dataset_type=self.dataset_type) 420 # Now we do things that we need an 
instantiated index for421 # ...first off, we create our field_info 
now./sw/tools/anaconda3/4.1.1/generic/lib/python3.5/site-packages/yt/frontends/boxlib/data_structures.py 
in __init__(self, ds, dataset_type) 906 def __init__(self, ds, 
dataset_type='nyx_native'):907 super(NyxHierarchy, self).__init__(ds, 
dataset_type)--> 908self._read_particle_header()909 910 def 
_read_particle_header(self):/sw/tools/anaconda3/4.1.1/generic/lib/python3.5/site-packages/yt/frontends/boxlib/data_structures.py 
in _read_particle_header(self) 909 910 def 
_read_particle_header(self):--> 911if not 
self.ds.parameters["particles"]:912 self.pgrid_info = 
np.zeros((self.num_grids, 3), dtype='int64')913 returnKeyError: 'particles'

Same problem with slices. I am not sure what exactly causes the error 
here, but since I can load datasets from cosmological simulations with 
Nyx and process them without problems, I suppose the problem outlined 
above is somehow related to the missing particles.

How can this be fixed?

Best
Wolfram

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