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']

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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'

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However, the field is there:

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[ 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

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Am I missing something obvious?

Thanks a lot for you help,