[yt-users] units in derived field

Desika Narayanan dnarayan at haverford.edu
Sun Dec 28 08:32:54 PST 2014


it's the latter.  cool, i'll try to issue a PR tonight.

thanks,
-d

On Sun, Dec 28, 2014 at 11:26 AM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

> Is this a derived field or a field that lives on disk in your data files?
>
> If it's the former, you can supply units using the "units" keyword
> argument of the add_field function.
>
> If it's the latter, I think you will need to make a small modification to
> the Gadget frontend to include StarFormationRate in the known_fields list.
> See "yt/frontends/gadget/fields.py" in the yt mercurial repository.
> On Sun, Dec 28, 2014 at 7:25 AM Desika Narayanan <dnarayan at haverford.edu>
> wrote:
>
>> Hi All,
>>
>> When I access some derived fields (like StarFormationRate) in a galaxy
>> simulation, the units are dimensionless:
>>
>> In [*4*]: ad = ds.all_data()
>>
>> In [*5*]: ad[("PartType0","StarFormationRate")]
>>
>> Out[*5*]:
>>
>> YTArray([  0.00000000e+00,   0.00000000e+00,   8.29740111e-06, ...,
>>
>>          0.00000000e+00,   0.00000000e+00,   0.00000000e+00])
>> (dimensionless)
>>
>>
>> I'd like to assign the units to this field.  I figure I could define a
>> field with the right units, but it seems like it might be possible to just
>> assign units to the ds StarFormationRate field as is.  Is this possible, or
>> should I just define a new field?
>>
>> thanks,
>> desika
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>
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