[yt-users] Error on loading generic AMR grid data and plotting a slice: AttributeError: 'StreamGrid' object has no attribute 'dds'

[David Ketcheson]

I have some AMR output data (from AMRClaw, for which there is not a yt
front end) and I'm following instructions here:

http://yt-project.org/docs/3.0/examining/loading_data.html#generic-amr-data

My script is here:

https://gist.github.com/30d8bdf41422dc20bb95

The yt.load_amr_grids() command seems to complete successfully.

But when I try to generate a slice plot, I get the following:

AttributeError                            Traceback (most recent call last)
<ipython-input-30-384f3d2d8b79> in <module>()
----> 1 yt.SlicePlot(ds, 0, "density")

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/visualization/plot_window.pyc
in SlicePlot(ds, normal, fields, axis, *args, **kwargs)
   1840             del kwargs['north_vector']
   1841
-> 1842         return AxisAlignedSlicePlot(ds, normal, fields, *args,
**kwargs)

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/visualization/plot_window.pyc
in __init__(self, ds, axis, fields, center, width, axes_unit, origin,
fontsize, field_parameters, window_size, aspect)
   1012         slc = ds.slice(axis, center[axis],
   1013             field_parameters = field_parameters, center=center)
-> 1014         slc.get_data(fields)
   1015         PWViewerMPL.__init__(self, slc, bounds, origin=origin,
   1016                              fontsize=fontsize, fields=fields,

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/data_objects/data_containers.pyc
in get_data(self, fields)
    600     def get_data(self, fields=None):
    601         if self._current_chunk is None:
--> 602             self.index._identify_base_chunk(self)
    603         if fields is None: return
    604         nfields = []

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/data_objects/data_containers.pyc
in index(self)
    127         if self._index is not None:
    128             return self._index
--> 129         self._index = self.ds.index
    130         return self._index
    131

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/data_objects/static_output.pyc
in index(self)
    272                 raise RuntimeError("You should not instantiate
Dataset.")
    273             self._instantiated_index = self._index_class(
--> 274                 self, dataset_type=self.dataset_type)
    275             # Now we do things that we need an instantiated index
for
    276             # ...first off, we create our field_info now.

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/frontends/stream/data_structures.pyc
in __init__(self, ds, dataset_type)
    167         self.float_type = "float64"
    168         self.directory = os.getcwd()
--> 169         GridIndex.__init__(self, ds, dataset_type)
    170
    171     def _count_grids(self):

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/geometry/geometry_handler.pyc
in __init__(self, ds, dataset_type)
     55
     56         mylog.debug("Setting up domain geometry.")
---> 57         self._setup_geometry()
     58
     59         mylog.debug("Initializing data grid data IO")

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/geometry/grid_geometry_handler.pyc
in _setup_geometry(self)
     56
     57         mylog.debug("Constructing grid objects.")
---> 58         self._populate_grid_objects()
     59
     60         mylog.debug("Re-examining index")

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/frontends/stream/data_structures.pyc
in _populate_grid_objects(self)
    242     def _populate_grid_objects(self):
    243         for g in self.grids:
--> 244             g._setup_dx()
    245         self.max_level = self.grid_levels.max()
    246

/Users/ketch/anaconda/lib/python2.7/site-packages/yt/data_objects/grid_patch.pyc
in _setup_dx(self)
    136         id = self.id - self._id_offset
    137         if self.Parent is not None:
--> 138             self.dds = self.Parent.dds.ndarray_view() /
self.ds.refine_by
    139         else:
    140             LE, RE = self.index.grid_left_edge[id,:], \

AttributeError: 'StreamGrid' object has no attribute 'dds'

I would greatly appreciate any help.
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