[yt-users] Accessing some derived fields

Prachi Parihar pparihar at astro.caltech.edu
Wed Dec 7 15:52:14 PST 2016


Hi all,

I am trying to compute vorticity for a fire snapshot. I've put down a
sphere (sp), and can access some other derived fields, but for some reason
things like vorticity give me the following error. Does anyone have
suggestions as to what I'm doing wrong?

>>> sp['gas','velocity_magnitude']
YTArray([ 53724618.56288539,  48756921.3449135 ,  46197475.78549621, ...,
        53664392.60568497,  46881343.68564206,  50050673.058614  ]) cm/s
>>> sp['gas','vorticity_x']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 281, in __getitem__
    self.get_data(f)
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 1295, in get_data
    self._generate_fields(fields_to_generate)
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 1315, in _generate_fields
    fd = self._generate_field(field)
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 318, in _generate_field
    tr = self._generate_fluid_field(field)
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 336, in _generate_fluid_field
    rv = self._generate_spatial_fluid(field, ngt_exception.ghost_zones)
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
data_objects/data_containers.py", line 359, in _generate_spatial_fluid
    for i, chunk in enumerate(chunks):
  File "/home/prachi/anaconda2/lib/python2.7/site-packages/yt/
geometry/particle_geometry_handler.py", line 179, in _chunk_spatial
    g = og.retrieve_ghost_zones(ngz, [], smoothed=True)
AttributeError: 'ParticleOctreeSubset' object has no attribute
'retrieve_ghost_zones'
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