[yt-users] Accumulation in 3.0

John Regan johnanthonyregan at gmail.com
Tue Nov 4 10:26:32 PST 2014


Hi Matt,

It looks like the particle mass is in grams but the unit assignment sets it
to code_mass. Then when the units is set to Msun the numbers get crazy. I
can't see easily where the units for the particle mass get set in the
create_profile routine (in field/particle_fields the mass is set to g in
particle_mass()). Any idea where this might be getting all mixed up or how
to force the mass units to be grams in create_profile()?

Cheers,
John

On Mon, Nov 3, 2014 at 5:18 PM, John Regan <johnanthonyregan at gmail.com>
wrote:

> Yeah that's what I thought first but 1 Msun = 10^33 g. So that would put
> the inner DM mass at ~ 10^14 right?
>
> The total mass inside the sphere of 1kpc is only about 10^7 though.
> Something is not quite correct somewhere in the profiling calculation.
>
> On Mon, Nov 3, 2014 at 5:16 PM, Matthew Turk <matthewturk at gmail.com>
> wrote:
>
>> Yup, those sure are weird!  Looks to me like a units issue -- any chance
>> those could be in grams but reported in Msun?
>>
>>
>> On Mon Nov 03 2014 at 11:15:23 AM John Regan <johnanthonyregan at gmail.com>
>> wrote:
>>
>>> Hi Matt,
>>>
>>> Ah I see what you mean now. Changing 'radius' to 'particle_radius'
>>> worked nicely. However, the results are bit weird.
>>>
>>> rpm = yt.create_profile(sp, ['particle_radius'],  ['particle_mass'],
>>>                         units = {'particle_radius': 'pc',
>>> 'particle_mass' : 'Msun'},
>>>                         n_bins=20, weight_field=None, accumulation=True,
>>> fractional=False)
>>> print "Particle Mass = ", rpm["particle_mass"]
>>>
>>> Particle Mass =  [  0.00000000e+00   0.00000000e+00   0.00000000e+00
>>> 2.17730865e+47
>>>    2.39503952e+48   5.00780990e+48   9.36242721e+48   2.87404742e+49
>>>    8.03426893e+49   1.91385431e+50   4.44824158e+50   1.02681876e+51
>>>    2.28900459e+51   4.74174278e+51   1.05066029e+52   2.07602025e+52
>>>    3.49614805e+52   4.89060538e+52   6.82621100e+52   1.08907237e+53]
>>> Msun
>>>
>>> Any idea what is causing the crazy values?
>>>
>>> On Mon, Nov 3, 2014 at 4:23 PM, Matthew Turk <matthewturk at gmail.com>
>>> wrote:
>>>
>>>> Hi John,
>>>>
>>>> It was exactly the same error, when you used particle_radius in both
>>>> places that "radius" was used before?
>>>>
>>>> -Matt
>>>>
>>>>
>>>> On Mon Nov 03 2014 at 7:06:44 AM John Regan <johnanthonyregan at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi Kacper,
>>>>>
>>>>> Of course - I should have noticed that. Thanks for finding that.
>>>>> However, I notice that when I try to create a profile for the Dark
>>>>> (particle) matter I run into some trouble as well.
>>>>>
>>>>> rpm = yt.create_profile(sp, 'radius',  ['particle_mass'],
>>>>>                         units = {'radius': 'pc', 'particle_mass' :
>>>>> 'Msun'},
>>>>>                         n_bins=20, weight_field=None,
>>>>> accumulation=True, fractional=False)
>>>>>
>>>>> This gives the following error:
>>>>>
>>>>> Traceback (most recent call last):
>>>>>   File "EnclosedMass.py", line 35, in <module>
>>>>>     n_bins=20, weight_field=None, accumulation=True, fractional=False)
>>>>>   File
>>>>> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/profiles.py",
>>>>> line 1361, in create_profile
>>>>>     obj.add_fields([field for field in fields])
>>>>>   File
>>>>> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/profiles.py",
>>>>> line 782, in add_fields
>>>>>     self._bin_chunk(chunk, fields, temp_storage)
>>>>>   File
>>>>> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/profiles.py",
>>>>> line 979, in _bin_chunk
>>>>>     rv = self._get_data(chunk, fields)
>>>>>   File
>>>>> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/profiles.py",
>>>>> line 910, in _get_data
>>>>>     arr[:,i] = chunk[field][filter]
>>>>>   File
>>>>> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/units/yt_array.py", line
>>>>> 963, in __getitem__
>>>>>     ret = super(YTArray, self).__getitem__(item)
>>>>> ValueError: too many boolean indices
>>>>>
>>>>>
>>>>> Has anyone seen this before? For the 'cell_mass' everything works
>>>>> fine.
>>>>>
>>>>> Cheers,
>>>>> John
>>>>>
>>>>> On Sat, Nov 1, 2014 at 6:49 PM, Kacper Kowalik <
>>>>> xarthisius.kk at gmail.com> wrote:
>>>>>
>>>>>> Hi John,
>>>>>> I think that if you want to compute "total" instead of mean you need
>>>>>> to set weight_field to None in create_profile.
>>>>>> Cheers,
>>>>>> Kacper
>>>>>>
>>>>>> On Sat Nov 01 2014 at 6:10:50 AM John Regan <
>>>>>> johnanthonyregan at gmail.com> wrote:
>>>>>>
>>>>>>> Hi All,
>>>>>>>
>>>>>>> Is the accumulation flag working in 3.0?
>>>>>>> I tried to plot the enclosed mass in a sphere and I got some funny
>>>>>>> results.
>>>>>>>
>>>>>>> rpm = yt.create_profile(sp, 'radius',  'cell_mass',
>>>>>>>                         units = {'radius': 'pc', 'cell_mass' :
>>>>>>> 'Msun'},
>>>>>>>                         weight_field='density', accumulation=True,
>>>>>>> fractional=False)
>>>>>>>
>>>>>>> print "Mass = ", rpm["gas", "cell_mass"]
>>>>>>>
>>>>>>> In this case bin[n-1] gives a mass of something like 0.5 Msun but
>>>>>>> when I print the totals quantity I get a value of several orders of
>>>>>>> magnitude higher and closer to what I would expect.
>>>>>>>
>>>>>>> sp.quantities.total_quantity(["cell_mass", "particle_mass"])
>>>>>>>
>>>>>>> Cheers,
>>>>>>> John
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>>>>>>
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