[yt-users] yt.utilities.amr_utils

Renyue Cen cen at astro.princeton.edu
Sun Jan 13 12:22:11 PST 2013

Hi Matt,

It seems that my attempt to reuse "star_density" for a subset of stars does not work:
"star_density" remains the density of all stars when plotted.
But I also failed to redefine a new density that is called "SFRdensity" and feed it to AMRKDTree which is in turn
fed to camera to volume render. Here is what I did:

def _convertDensity(data):
    return data.convert("Density")
def _SFRdensity(field, data):
    blank = na.zeros(data.ActiveDimensions, dtype='float32')
    if data.NumberOfParticles == 0: return blank
#   filter  = data.pf.time_units['years']*(data.pf.current_time - data['creation_time']) < 1.e8
    filter  = data.pf.time_units['years']*(data.pf.current_time - data['creation_time']) < 1.e6
    if not filter.any(): return blank
                           blank, na.array(data.LeftEdge).astype(na.float64),
    return blank
add_field("SFRdensity", function=_SFRdensity,
          validators=[ValidateSpatial(0)], convert_function=_convertDensity)

    volume3 = AMRKDTree(pf, fields=["SFRdensity"]
               ,no_ghost=False, tree_type="domain"
               ,le=c-0.5*WW, re=c+0.5*WW)
    cam = pf.h.camera(c, L, W, (Nvec,Nvec), tf3, volume=volume3, no_ghost=False,log_fields=None

with the following error message:

Traceback (most recent call last):
  File "SFR.py", line 393, in <module>
    ,le=c-0.5*WW, re=c+0.5*WW)
  File "/u/jhwise/local/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/utilities/amr_kdtree/amr_kdtree.py", line 316, in __init__
    for field in self.fields]
  File "/u/jhwise/local/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/field_info_container.py", line 71, in __missing__
    return self.fallback[key]
  File "/u/jhwise/local/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/field_info_container.py", line 71, in __missing__
    return self.fallback[key]
  File "/u/jhwise/local/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/field_info_container.py", line 70, in __missing__
    raise KeyError("No field named %s" % key)
KeyError: 'No field named SFRdensity'

So I must be doing something wrong with defining the SFRdensity field.

Thanks very much,

On Jan 13, 2013, at 1:20 PM, Matthew Turk wrote:

> Hi Renyue,
> The module amr_utils became lib a while back.  But my guess is that
> you probably don't need to import it anyway, unless you are explicitly
> using one of the routines it provides.
> -Matt
> On Sun, Jan 13, 2013 at 12:18 PM, Renyue Cen <cen at astro.princeton.edu> wrote:
>> Hi,
>> I am trying to compute gridded density of some subset of particles.
>> So I tried to import some modules first in the python script as follows:
>> from yt.data_objects.field_info_container import \
>>    FieldInfoContainer, \
>>    NullFunc, \
>>    TranslationFunc, \
>>    FieldInfo, \
>>    ValidateParameter, \
>>    ValidateDataField, \
>>    ValidateProperty, \
>>    ValidateSpatial, \
>>    ValidateGridType
>> import yt.data_objects.universal_fields
>> from yt.utilities.physical_constants import mh
>> from yt.funcs import *
>> import yt.utilities.amr_utils as amr_utils
>> But I got this error message:
>> Traceback (most recent call last):
>>  File "SFR.py", line 28, in <module>
>>    import yt.utilities.amr_utils as amr_utils
>> ImportError: No module named amr_utils
>> Am I doing something wrong?
>> Thanks,
>> Renyue

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