[yt-users] Test for field

[Nathan Goldbaum]

Hi Elizabeth,

'particle type' is a particle field and I don't think it's ever a
well-defined key for the pf object.  For Enzo datasets, you can query for
'NumberOfParticles':

>>> pf = load('IsolatedGalaxy/galaxy0030/galaxy0030)'
>>> pf['NumberOfParticles]
1124450

Of course that won't tell you if particles of a given type are in the
dataset, to do that I think you need to load the particle type dataset into
memory as you did in your example.

-Nathan


On Sat, Feb 23, 2013 at 12:07 AM, Elizabeth Tasker <
tasker at astro1.sci.hokudai.ac.jp> wrote:

> Hi,
>
> I want to test if a data set at particles. I thought:
>
> pf.has_key("particle_type")
>
> would work, but oddly it doesn't since:
>
> In [17]: pf.has_key("particle_type")
> Out[17]: False
>
> yet:
>
> In [4]: dd = pf.h.all_data()
> In [5]: dd["particle_type"]
> yt : [INFO     ] 2013-02-23 17:00:43,826 Getting particle_type using
> ParticleIO
> Out[5]: array([11, 11, 11, ..., 11, 11, 11])
>
>
> Shouldn't  pf.has_key("particle_type") be true in this case?
>
> Elizabeth
>
>
>
>
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