[yt-users] non-converted fields?

[Nathan Goldbaum]

Hi Dave,

You can see the conversion factors yt applies by inspecting pf.conversion_factors.

-Nathan

On Mar 28, 2013, at 1:18 PM, David Collins <dcollins at physics.ucsd.edu> wrote:

> I tried Nathan's suggestion, but I'm still getting fields in CGS.  I
> did the following, and just ran it in a script (not messing with the
> plugins for now).  Is there anything else I need to do?  What I think
> is happening is that in D2, data['Density'] is already converted to
> cgs when it gets returned by D2.  Is there an easy way to get the
> density conversion function that's getting used, so I can have the
> converter return the inverse?  I added the ValidateGridType in order
> to try to force it to be read before the convert, that didn't work.
> 
> def D2(field,data):
>    return data['Density']
> def no_convert(data):
>    return 1
> add_field('D2',function=D2,convert_function=no_convert,
> validators=[ValidateGridType()])
> 
> 
>> Nathan's suggestion is a good one, as well.  In principle I don't know
>> why the conversion_factors option to the Enzo Static Output wouldn't
>> work for this as well.
> 
> I dropped this method a while ago when other yt things started to
> break.  I was doing something like this, but when I do it other things
> like "load" stop working. Even just creating this class, not actually
> doing anything with it, causes load to fail silently.
> 
> class EnzoStaticOutputMHD(EnzoStaticOutput):
>    def __init__(self,*args,**kwargs):
>        Conversion=2.5e-9/4.32e-7
>        EnzoStaticOutput.__init__(self,*args,conversion_override={
> 
> 'MagneticField_C_1': Conversion,
> 
> 'MagneticField_C_2':  Conversion,
> 
> 'MagneticField_C_3':  Conversion,
> 
> 'MagneticField_F_1':  Conversion,
> 
> 'MagneticField_F_3':  Conversion,
> 
> 'MagneticField_F_2':  Conversion},
>                                     **kwargs)
> 
> 
> 
>> 
>> If we had your subclass or some type of test incorporated into yt, we
>> would be able to verify that this functionality that you rely on
>> continues to work.  It can be difficult to anticipate all use cases
>> for the code, but this seems like one that could be valuable.
>> 
>> On Thu, Mar 28, 2013 at 3:21 PM, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>>> Hi David,
>>> 
>>> Another option would be to temporarily define a new field that has a null or
>>> trivial conversion function.
>>> 
>>> This field could live in your ~/.yt/my_plugins.py file so no need to touch
>>> the yt codebase.
>>> 
>>> -Nathan
>>> 
>>> On Mar 28, 2013, at 12:18 PM, David Collins <dcollins4096 at gmail.com> wrote:
>>> 
>>> That reads a single grid from the hierarchy?  Can I get yt to do projections
>>> and whatnot in those units?
>>> 
>>> Previously I had subclassed EnzoStaticOutput with customized conversion
>>> factors.  It's a bit outdated.
>>> 
>>> Thanks!
>>> d.
>>> 
>>> 
>>> On Thu, Mar 28, 2013 at 1:09 PM, Matthew Turk <matthewturk at gmail.com> wrote:
>>>> 
>>>> On Thu, Mar 28, 2013 at 3:07 PM, David Collins <dcollins4096 at gmail.com>
>>>> wrote:
>>>>> 
>>>>> Hi!
>>>>> 
>>>>> Is there a way to get yt to not convert data to CGS?  I'm doing some
>>>>> debugging, and its easier to see the code units.
>>>> 
>>>> Read the data directly.
>>>> 
>>>> pf.h.io._read_data_set(grid, field)
>>>> 
>>>>> 
>>>>> I had a work around for this a while ago, but there has been a bunch of
>>>>> code
>>>>> development since then.
>>>> 
>>>> What was your old way?
>>>> 
>>>>> 
>>>>> Thanks!
>>>>> d.
>>>>> 
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> 
> 
> -- 
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