[yt-users] Total Active Particles?

[Nathan Goldbaum]

On Mon, May 16, 2016 at 12:09 PM, David Collins <dcollins4096 at gmail.com>
wrote:

> Haha, that is my greatest downfall.  I hope I didn't take you away from
> vital tasks like watching for trucks.
> I'll take a look at that PR.
> I have a related stupid question-- With the conda-style install, what's
> the easiest way to switch between yt builds?
>

Do you mean switch between different yt versions? If so it's identical to
before. You navigate to the repo, pull in the changes you want to update
to, update to them, and do "setup.py develop".


>
> d.
>
> On Sun, May 15, 2016 at 5:38 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
>> Well, Dave nerd-sniped me:
>>
>> https://bitbucket.org/yt_analysis/yt/pull-requests/2176
>>
>> Hopefully this will be in yt 3.3.
>>
>> On Fri, May 13, 2016 at 5:05 PM, Nathan Goldbaum <nathan12343 at gmail.com>
>> wrote:
>>
>>> If there aren't any particles, then (in my example) ('CenOstriker',
>>> 'creation_time') won't be in ds.field_list, so you could do something like:
>>>
>>>     if field in ds.field_list:
>>>         nparticles = ad[field].shape[0]
>>>     else:
>>>         nparticles = 0
>>>
>>> Nathan
>>>
>>>
>>> On Friday, May 13, 2016, David Collins <dcollins4096 at gmail.com> wrote:
>>>
>>>>
>>>> Cool.  I may try my hand at such an object.
>>>>
>>>> The problem with doing something like ad['CenOstriker','creation_time']
>>>> is that if there are no particles it raises an error, so for smooth flying
>>>> I'd need to put it in a try/except, but that's not a huge deal.
>>>>
>>>>
>>>> Thanks!
>>>> d.
>>>>
>>>> On Fri, May 13, 2016 at 4:42 PM, Nathan Goldbaum <nathan12343 at gmail.com
>>>> > wrote:
>>>>
>>>>> This uses the ActiveParticleCosmology dataset from yt-project.org/data
>>>>> :
>>>>>
>>>>>     import yt
>>>>>     ds = yt.load('ActiveParticleCosmology/DD0046/DD0046')
>>>>>     ad = ds.all_data()
>>>>>     print(ad['CenOstriker', 'creation_time'].shape)
>>>>>
>>>>> Which prints out (899755,), so there are 899755 active particles in
>>>>> this simulation.
>>>>>
>>>>> There isn't a convenience function to get the number of each particle
>>>>> type in the simulation. Adding such a convenience function (or populating
>>>>> some Dataset attribute with this information when we load the data so we
>>>>> don't need to make another I/O pass over the dataset) would be a great
>>>>> addition to yt. There's even a very long-standing issue opened by me about
>>>>> this...
>>>>>
>>>>> https://bitbucket.org/yt_analysis/yt/issues/718
>>>>>
>>>>> On Fri, May 13, 2016 at 3:32 PM, David Collins <dcollins4096 at gmail.com
>>>>> > wrote:
>>>>>
>>>>>> Hi, Everybody!
>>>>>>
>>>>>> Is there a field or function that totals the number of active
>>>>>> particles?  I see that I can get it from the grid, but I don't see anything
>>>>>> for the whole ds.
>>>>>>
>>>>>> Thanks,
>>>>>> d.
>>>>>>
>>>>>> --
>>>>>> -- Sent from a computer.
>>>>>>
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>>>>>>
>>>>>>
>>>>>
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>>>>>
>>>>
>>>>
>>>> --
>>>> -- Sent from a computer.
>>>>
>>>
>>
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>>
>
>
> --
> -- Sent from a computer.
>
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