Awesome, thanks. d. On Mon, Oct 25, 2010 at 3:24 PM, Matthew Turk <matthewturk@gmail.com> wrote:

Hi Dave,

This is the field detection mechanism, to determine if a field is available to be used.  It's how the list derived_field_list is constructed upon hierarchy instantiation, and it's how dependencies are calculated.

If you look in the definition of the FieldDetector object (yt/data_objects/field_info_container) you can see where the IO mechanism is mocked up in the locally-defined class (which violates the yt style guide, I see now) fake_hierarchy and its nested fake_io. Add the pop method to the fake_io object, identical to _read_data_set.

Go ahead and push the changes when you've made them, this is a valuable change.

Best,

Matt

On Mon, Oct 25, 2010 at 3:20 PM, david collins <antpuncher@gmail.com> wrote:

...

Hi, Everybody!

In order to ensure all my units are being done correctly, I have a field 'TE' that forces 'TotalEnergy' to be read off disk, like this:

def _TE(field,data):    return data.hierarchy.io.pop(data, 'TotalEnergy')

lagos.add_field("TE", function=_TE,               validators=[lagos.ValidateGridType()])

This lets me circumvent the assumptions that yt makes on a field by that name, specifically unit conversion.  However, I can't seem to project it.  I get the error, below.  Does anyone have any ideas of either different ways to do this, or ways around the projection error?

Thanks, d.

Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "tmp.py", line 9, in <module>    mp.plot()  File "/home/dccollin/yt/uber.py", line 398, in plot    fig = self.add_plots(field,axis,FirstOne)  File "/home/dccollin/yt/uber.py", line 676, in add_plots    **extra_args)  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/raven/plot_collection.py", line 719, in add_projection    **field_parameters)  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 1205, in __init__    self._refresh_data()  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 237, in _refresh_data    self.get_data()  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 1380, in get_data    self._get_dependencies(fields), self.hierarchy.io)  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/ParallelTools.py", line 1438, in _get_dependencies    deps += ensure_list(fi[field].get_dependencies(pf=self.pf).requested)  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/field_info_container.py", line 297, in get_dependencies    self(e)  File "/projects/lca-group/local-dev/lib/python2.6/site-packages/yt-2.0dev-py2.6-linux-x86_64.egg/yt/lagos/field_info_container.py", line 318, in __call__    dd = self._function(self, data)  File "xtra_fields.py", line 161, in _TE    dataset = data.hierarchy.io.pop(data, 'TotalEnergy') AttributeError: 'fake_io' object has no attribute 'pop'

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