Hi Molly,

I think this is a bug in yt - the issue is that the field_info associated with the original profile object is not being saved to the profile dataset.

I've filed this issue here:

https://bitbucket.org/yt_analysis/yt/issues/1267

For now, you should be able to create a PhasePlot using the profile object you created from the original dataset:

    nhT_prof_new = yt.create_profile(sph, [('gas', 'H_number_density'),('gas','temperature')], fields='cell_mass',
                                                          extrema=extrema,fractional=True, n_bins=6)
    plot = yt.PhasePlot.from_profile(nht_prof_new)

-Nathan

On Mon, Aug 29, 2016 at 12:45 PM, Molly Peeples <molly@stsci.edu> wrote:
Hi folks,

I’m trying to construct and save a 2d profile container to make a phase plot. Here’s what I have:

nhT_prof_new = yt.create_profile(sph, [('gas', 'H_number_density'),('gas','temperature')], fields='cell_mass', extrema=extrema,fractional=True, n_bins=6)

nhT_prof_new.save_as_dataset()

prof_ds = yt.load("snap_047_z000p000_Profile2D.h5")


(just using a small number of bins for now to play with…)

In [115]: prof_ds.data["temperature"]

     ...: prof_ds.data["H_number_density"]

     ...: prof_ds.data["cell_mass"]

     ...: 

Out[115]: 

YTArray([[ 0.01685665,  0.0405085 ,  0.03575519,  0.03091732,  0.02552936,

         0.0230379 ],

       [ 0.03770747,  0.05441198,  0.04859202,  0.03285325,  0.02385346,

         0.04674817],

       [ 0.03022001,  0.05150457,  0.03591368,  0.01974481,  0.01052408,

         0.00331175],

       [ 0.04278126,  0.01889035,  0.0177686 ,  0.01644028,  0.01598129,

         0.00578262],

       [ 0.05010083,  0.06573628,  0.04247398,  0.03914208,  0.        ,

         0.        ],

       [ 0.        ,  0.11691224,  0.        ,  0.        ,  0.        ,

         0.        ]]) dimensionless


but when I try to create a PhasePlot:

In [116]: p = yt.PhasePlot(prof_ds.data, "H_number_density", "temperature","cell_mass",weight_field=None)

     ...: 

---------------------------------------------------------------------------

KeyError                                  Traceback (most recent call last)

<ipython-input-116-37b81d75b563> in <module>()

----> 1 p = yt.PhasePlot(prof_ds.data, "H_number_density", "temperature","cell_mass",weight_field=None)


/Users/molly/anaconda2/envs/astroconda/lib/python2.7/site-packages/yt/visualization/profile_plotter.pyc in __init__(self, data_source, x_field, y_field, z_fields, weight_field, x_bins, y_bins, accumulation, fractional, fontsize, figure_size)

    756 

    757         type(self)._initialize_instance(self, data_source, profile, fontsize,

--> 758                                         figure_size)

    759 

    760     @classmethod


/Users/molly/anaconda2/envs/astroconda/lib/python2.7/site-packages/yt/visualization/profile_plotter.pyc in _initialize_instance(cls, obj, data_source, profile, fontsize, figure_size)

    773         obj.profile = profile

    774         super(PhasePlot, obj).__init__(data_source, figure_size, fontsize)

--> 775         obj._setup_plots()

    776         obj._initfinished = True

    777         return obj


/Users/molly/anaconda2/envs/astroconda/lib/python2.7/site-packages/yt/visualization/profile_plotter.pyc in _setup_plots(self)

    854                     cax = self.plots[f].cax

    855 

--> 856             x_scale, y_scale, z_scale = self._get_field_log(f, self.profile)

    857             x_title, y_title, z_title = self._get_field_title(f, self.profile)

    858 


/Users/molly/anaconda2/envs/astroconda/lib/python2.7/site-packages/yt/visualization/profile_plotter.pyc in _get_field_log(self, field_z, profile)

    813 

    814     def _get_field_log(self, field_z, profile):

--> 815         zfi = profile.field_info[field_z]

    816         if self.x_log is None:

    817             x_log = profile.x_log


KeyError: ('data', 'cell_mass')




Suggestions?
—Molly

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