Re: [yt-users] Particle Angular momentum Profiles

23 Oct 2012

      On Tue, Oct 23, 2012 at 3:25 PM, Jun-Hwan Choi  wrote:
...
Thank you,
It works after I weight particlemass for Angular momentum profile as follow:
...
profile.add_fields('ParticleSpecificAngularMomentumZ',weight='ParticleMass')
(If I omit the weight field, it crashed because it assume
weight='CellMassMsun'
Is ParticleMass a general weight field for Particles like CellMass?
Is there any other suggested field?
ParticleMass should be the mass in g, yup . ParticleMassMsun might be
useful, too!

For what it's worth, codifying these names is a high priority for us.

-Matt
...
Thank you,
Junhwan
On 10/23/12 11:25, Matthew Turk wrote:
...
Hi Jun-Hwan,
What's happening is that the particles are being binned according to a
fluid field -- "RadiuspcXY" in this case.  You have to bin them by a
particle field.
On Tue, Oct 23, 2012 at 11:19 AM, Jun-Hwan Choi  wrote:
...
Hi
I try to calculate the dark matter angular momentum profile using
following
routine:
#####################################
import matplotlib.pyplot as plt
import pylab as pl
def _RadiuspcXY(field, data):
     center = data.get_field_parameter("center")
     DW = data.pf.domain_right_edge - data.pf.domain_left_edge
     radius = na.zeros(data["x"].shape, dtype='float64')
     for i, ax in enumerate('xy'):
         r = na.abs(data[ax] - center[i])
         radius += na.minimum(r, na.abs(DW[i]-r))**2.0
     na.sqrt(radius, radius)
     return radius
If you change this to use "particle_position_x" and
"particle_position_y" it should work.  Also:
...
def _ConvertRadius(data):
     return data.convert("pc")
add_field("RadiuspcXY", function=_RadiuspcXY,
           validators=[ValidateParameter("center")],
           convert_function = _ConvertRadius, units=r"\rm{pc}",
           display_name="RadiusXY")
add the argument particle_type=True.
Let us know if that works!  :)
-Matt
...
Nbin = 75
rdisk = 2000
hdisk = 10
pf = load("DD0046/DD0046")
rmin = 2.0*pf.h.get_smallest_dx()*pf.units['pc']]
center = pf.h.find_max("Density")[1]
disk = pf.h.disk(center, [0,0,1], rdisk/pf.units['pc'],
hdisk/pf.units['pc']
)
profile = BinnedProfile1D(disk, Nbin, "Radiuspc", max(rmin), rdisk,
log_space=True, lazy_reader=True, end_collect=False)
profile.add_fields('ParticleSpecificAngularMomentumZ')
plt.plot(profile['RadiuspcXY'],
profile['ParticleSpecificAngularMomentumZ'])
And I got the following error message:
yt : [INFO     ] 2012-10-23 11:16:00,124 Parameters: current_time
= 4.600008999
yt : [INFO     ] 2012-10-23 11:16:00,124 Parameters: domain_dimensions
= [64 64 64]
yt : [INFO     ] 2012-10-23 11:16:00,125 Parameters: domain_left_edge
= [ 0.  0.  0.]
yt : [INFO     ] 2012-10-23 11:16:00,125 Parameters: domain_right_edge
= [ 1.  1.  1.]
yt : [INFO     ] 2012-10-23 11:16:00,126 Parameters:
cosmological_simulation
= 0.0
yt : [INFO     ] 2012-10-23 11:16:00,138 Getting the binary hierarchy
yt : [INFO     ] 2012-10-23 11:16:00,168 Finished with binary hierarchy
reading
yt : [INFO     ] 2012-10-23 11:16:00,623 Max Value is 1.55814e-16 at
0.5001935958862305 0.4999227523803749 0.4994192123413048 in grid
EnzoGrid_1396 at level 13 (5, 3, 3)
Traceback (most recent call last):
   File "JprofDM.py", line 51, in<module>
     profile.add_fields('ParticleSpecificAngularMomentumZ')
   File
"/home/jhchoi/common/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/profiles.py",
line 168, in add_fields
     self._lazy_add_fields(fields, weight, accumulation)
   File
"/home/jhchoi/common/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/profiles.py",
line 108, in _lazy_add_fields
     args=args, check_cut=True)
   File
"/home/jhchoi/common/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/profiles.py",
line 55, in save_state
     tr = func(*args, **kwargs)
   File
"/home/jhchoi/common/lib/python2.7/site-packages/yt-2.4-py2.7-linux-x86_64.egg/yt/data_objects/profiles.py",
line 275, in _bin_field
     source_data = source_data[mi]
ValueError: too many boolean indices
What can be the problem?
I compute the gas Angular momentum by simply change
ParticleSpecificAngularMomentumZ to  SpecificAngularMomentumZ, it works.
As a result, I suspect the way to handle the particles.
Thanks in advance,
Junhwan
--
--------------------------------------------------------------
Jun-Hwan Choi, Ph.D.
Department of Physics and Astronomy, University of Kentucky
Tel: (859) 897-6737        Fax: (859) 323-2846
Email: jhchoi@pa.uky.edu   URL: http://www.pa.uky.edu/~jhchoi
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--
--------------------------------------------------------------
Jun-Hwan Choi, Ph.D.
Department of Physics and Astronomy, University of Kentucky
Tel: (859) 897-6737        Fax: (859) 323-2846
Email: jhchoi@pa.uky.edu   URL: http://www.pa.uky.edu/~jhchoi
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