[yt-dev] Defining new particle unions?

[Nathan Goldbaum]

On Fri, Apr 11, 2014 at 9:02 AM, Britton Smith <brittonsmith at gmail.com>wrote:

> Hi Nathan,
>
> This is how I have used particle filters:
> http://paste.yt-project.org/show/4509/
>
> I could be wrong, but my understanding is that particle filters had to be
> added directly to an instantiated pf as in my example.  If that is the
> case, then this YTEP is inaccurate and should be altered.
>

I think you're right.  I was also unable to modify the enzo frontend to
include a star particle ptype based on a filter, but that might have been
due to a mistake on my part.

On a somewhat happier note, I was able to use a particle filter to measure
the star formation rate in my simulation.  The script might be generally
useful for other enzo and yt-3.0 users, so I've pasted a version of it here
using the IsolatedGalaxy dataset: http://paste.yt-project.org/show/4514/

For IsolatedGalaxy, this creates the following plot:

[image: Inline image 1]

Pretty cool, I think!

To all those who came up with the particle filter API, bravo!  I seriously
doubt I would have been able to write a concise and understandable script
in older versions of yt.


>
> Britton
>
>
> On Thu, Apr 10, 2014 at 10:47 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:
>
>> It looks like I was searching for the wrong term - I wanted a particle
>> *filter*, not a *union*.
>>
>> More information in this YTEP:
>> http://ytep.readthedocs.org/en/latest/YTEPs/YTEP-0014.html
>>
>> I believe the text of the YTEP can readily be incorporated into the docs
>> - I will do so once I have a working example of a particle filter.
>>
>> -Nathan
>>
>>
>> On Thu, Apr 10, 2014 at 2:13 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:
>>
>>> Hi all,
>>>
>>> I'm trying to define a particle union for my dataset that represents
>>> stars formed during the simulation.  The most straightforward way to
>>> accomplish this is to use a mass cut.
>>>
>>> Does anyone have examples of how to set up a particle union?  Bonus if
>>> it uses enzo data.
>>>
>>> In return for any helpful advice anyone can give, I will add sorely
>>> needed documentation for particle unions to the 3.0 docs.
>>>
>>> -Nathan
>>>
>>
>>
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>>
>
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