[yt-users] Problems finding halos

[Britton Smith]

Hi Miguel,

It looks to me like the halo finder is failing because it cannot find any
particles.  If you do:
print pf.get_parameter('NumberOfParticles')
what does is show?

Britton

2011/7/22 Miguel Angel González <miguelglezbol at gmail.com>

> Hi YT user,
>
> I'm new using YT, and I'm already having problems when I've tried
> to use the HOP, when I write the commands in Python, this comes out:
> >>> from yt.mods import *
> >>> from yt.analysis_modules.halo_finding.api import *
> >>> pf = load("data0004")
> >>> halo_list = HaloFinder(pf)
> yt         INFO       2011-07-21 19:38:42,838 Getting the binary hierarchy
> yt         INFO       2011-07-21 19:38:42,846 Finished with binary
> hierarchy reading
> yt         INFO       2011-07-21 19:38:42,849 Adding Phi to list of fields
> Warning: invalid value encountered in sqrt
> Warning: invalid value encountered in sqrt
> yt         WARNING    2011-07-21 19:38:43,009 No particle_type, no
> creation_time, so not distinguishing.
> yt         INFO       2011-07-21 19:38:43,013 Getting ParticleMassMsun
> using ParticleIO
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File
> "/usr/local/yt-unknown/src/yt-hg/yt/analysis_modules/halo_finding/halo_objects.py",
> line 1821, in __init__
>
>  self._mpi_allsum((self._data_source["ParticleMassMsun"][select]).sum(dtype='float64'))
>  File "/usr/local/yt-unknown/src/yt-hg/yt/data_objects/data_containers.py",
> line 279, in __getitem__
>    self.get_data(key)
>  File "/usr/local/yt-unknown/src/yt-hg/yt/data_objects/data_containers.py",
> line 1918, in get_data
>    self.particles.get_data(field)
>  File "/usr/local/yt-unknown/src/yt-hg/yt/data_objects/particle_io.py",
> line 92, in get_data
>    conv_factors)
>  File "/usr/local/yt-unknown/src/yt-hg/yt/frontends/enzo/io.py", line 154,
> in _read_particles
>    filenames, ids, conv_factors = zip(*sorted(zip(filenames, ids,
> conv_factors)))
> ValueError: need more than 0 values to unpack
>
> Does anyone know how to fix this trouble?
>
> Thanks in advance, Miguel Gonzalez.
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