Hi All, I just updated to the latest version of yt, hoping that this would be fixed, but it seems not to be: the "TotalMass" function is broken for Orion data, and, from what I can tell, for any data set that doesn't contain dark matter particles. Here's what I get when I try to use it: In [1]: pf=load('data.0030.3d.hdf5') yt : [WARNING ] 2013-05-06 16:43:36,339 Setting 1.0 in code units to be 1.0 cm yt : [WARNING ] 2013-05-06 16:43:36,339 No time units. Setting 1.0 = 1 second. yt : [INFO ] 2013-05-06 16:43:36,340 Parameters: current_time = 6.78585436617e+13 yt : [INFO ] 2013-05-06 16:43:36,340 Parameters: domain_dimensions = [256 256 256] yt : [INFO ] 2013-05-06 16:43:36,341 Parameters: domain_left_edge = [ -1.68000000e+18 -1.68000000e+18 -1.68000000e+18] yt : [INFO ] 2013-05-06 16:43:36,341 Parameters: domain_right_edge = [ 1.68000000e+18 1.68000000e+18 1.68000000e+18] In [2]: dd=pf.h.all_data() ^[[Ayt : [INFO ] 2013-05-06 16:43:53,804 Adding unknown field gravitational-potential to list of fields In [3]: dd.quantities["TotalMass"]() --------------------------------------------------------------------------- KeyError Traceback (most recent call last) /home3/mkrumhol/yt-x86_64/src/yt-hg/scripts/iyt in <module>() ----> 1 dd.quantities["TotalMass"]() /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/derived_quantities.pyc in __call__(self, *args, **kwargs) 90 self._data_source.pf.h.io) 91 if lazy_reader and not self.force_unlazy: ---> 92 return self._call_func_lazy(args, kwargs) 93 else: 94 return self._call_func_unlazy(args, kwargs) /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/derived_quantities.pyc in _call_func_lazy(self, args, kwargs) 97 self.retvals = [ [] for i in range(self.n_ret)] 98 for gi,g in enumerate(self._get_grids()): ---> 99 rv = self.func(GridChildMaskWrapper(g, self._data_source), *args, **kwargs) 100 if not iterable(rv): rv = (rv,) 101 for i in range(self.n_ret): self.retvals[i].append(rv[i]) /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/derived_quantities.pyc in _TotalMass(data) 152 """ 153 baryon_mass = data["CellMassMsun"].sum() --> 154 particle_mass = data["ParticleMassMsun"].sum() 155 return [baryon_mass + particle_mass] 156 def _combTotalMass(data, total_mass): /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/derived_quantities.pyc in __getitem__(self, item) 58 def __getitem__(self, item): 59 if item not in self.local_cache: ---> 60 data = self.data_source._get_data_from_grid(self.grid, item) 61 self.local_cache[item] = data 62 return self.local_cache[item] /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc in save_state(self, grid, field, *args, **kwargs) 93 old_keys = grid.field_data.keys() 94 grid.field_parameters = self.field_parameters ---> 95 tr = func(self, grid, field, *args, **kwargs) 96 grid.field_parameters = old_params 97 grid.field_data = YTFieldData( [(k, grid.field_data[k]) for k in old_keys] ) /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc in _get_data_from_grid(self, grid, field) 2643 return np.array([f[i,:][pointI] for i in range(3)]) 2644 else: -> 2645 tr = grid[field] 2646 if tr.size == 1: # dx, dy, dz, cellvolume 2647 tr = tr * np.ones(grid.ActiveDimensions, dtype='float64') /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.pyc in __getitem__(self, key) 155 """ 156 if key not in self.field_data: --> 157 self.get_data(key) 158 return self.field_data[key] 159 /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.pyc in get_data(self, field, convert) 198 else: raise 199 else: --> 200 self._generate_field(field) 201 return self.field_data[field] 202 /home3/mkrumhol/yt-x86_64/src/yt-hg/yt/data_objects/grid_patch.pyc in _generate_field(self, field) 145 self[field] = self.pf.field_info[field](self) 146 else: # Can't find the field, try as it might --> 147 raise exceptions.KeyError(field) 148 149 def has_key(self, key): KeyError: 'ParticleMassMsun' This isn't a huge deal, because I can use "TotalQuantity" on "Density" as a workaround, but I thought I would report it. -- Mark Krumholz krumholz@ucolick.org