def _new_galactics_model(halo_number_of_particles,
unit_system_converter=None,
do_scale=False,
verbose=False,
**keyword_arguments):
code = keyword_arguments.pop("code")
instance = code(unit_converter=unit_system_converter)
instance.parameters.halo_number_of_particles = halo_number_of_particles
for (key, value) in keyword_arguments.iteritems():
setattr(instance.parameters, key, value)
if verbose:
print "adopted galaxy model parameters:"
print instance.parameters
instance.generate_particles()
result = instance.particles.copy()
if hasattr(instance, "gas_particles") and len(instance.gas_particles) > 0:
resultgas = instance.gas_particles.copy()
else:
resultgas = Particles()
instance.stop()
if len(resultgas) > 0:
allpart = ParticlesSuperset([result, resultgas])
else:
allpart = result
allpart.move_to_center()
# do_scale *is* possible for case with unit converter
# note that in case of scaling the output galaxy parameters may be very different from the model
# parameters input
if do_scale:
print "Warning: do_scale for a large galactics model may be very slow"
if verbose:
print "Warning: do_scale typically changes the galaxy scale parameters quite a lot from the input parameters"
if len(resultgas) > 0:
# this is fixable
raise Exception(
"scaling of galaxy models with gas currently not possible")
allpart.scale_to_standard(convert_nbody=unit_system_converter)
if not unit_system_converter is None:
result = ParticlesWithUnitsConverted(
result, unit_system_converter.as_converter_from_si_to_generic())
result = result.copy()
if len(resultgas) > 0:
resultgas = ParticlesWithUnitsConverted(
resultgas,
unit_system_converter.as_converter_from_si_to_generic())
resultgas = resultgas.copy()
if len(resultgas) > 0:
# resultincludes the gas particles (but not under the same keys)
return resultgas, result
else:
return result
def _new_galactics_model(halo_number_of_particles, unit_system_converter=None, do_scale=False, verbose=False, **keyword_arguments):
code=keyword_arguments.pop("code")
instance = code(unit_converter=unit_system_converter, redirection="none" if verbose else "null")
instance.parameters.halo_number_of_particles = halo_number_of_particles
for (key, value) in keyword_arguments.iteritems():
setattr(instance.parameters, key, value)
if verbose:
print "adopted galaxy model parameters:"
print instance.parameters
instance.generate_particles()
result = instance.particles.copy()
if hasattr(instance,"gas_particles") and len(instance.gas_particles)>0:
resultgas=instance.gas_particles.copy()
else:
resultgas=Particles()
instance.stop()
if len(resultgas)>0:
allpart=ParticlesSuperset([result, resultgas])
else:
allpart=result
allpart.move_to_center()
# do_scale *is* possible for case with unit converter
# note that in case of scaling the output galaxy parameters may be very different from the model
# parameters input
if do_scale:
print "Warning: do_scale for a large galactics model may be very slow"
if verbose:
print "Warning: do_scale typically changes the galaxy scale parameters quite a lot from the input parameters"
if len(resultgas)>0:
# this is fixable
raise Exception("scaling of galaxy models with gas currently not possible")
allpart.scale_to_standard(convert_nbody=unit_system_converter)
if not unit_system_converter is None:
result = ParticlesWithUnitsConverted(result, unit_system_converter.as_converter_from_si_to_generic())
result = result.copy()
if len(resultgas)>0:
resultgas = ParticlesWithUnitsConverted(resultgas, unit_system_converter.as_converter_from_si_to_generic())
resultgas = resultgas.copy()
if len(resultgas)>0:
# resultincludes the gas particles (but not under the same keys)
return resultgas, result
else:
return result
def _new_galactics_model(halo_number_of_particles, unit_system_converter=None, do_scale=False, **keyword_arguments):
instance = GalactICs(unit_converter=unit_system_converter)
instance.parameters.halo_number_of_particles = halo_number_of_particles
for (key, value) in keyword_arguments.iteritems():
setattr(instance.parameters, key, value)
instance.generate_particles()
result = instance.particles.copy()
instance.stop()
result.move_to_center()
if do_scale:
result.scale_to_standard(convert_nbody=unit_system_converter)
if not unit_system_converter is None:
result = ParticlesWithUnitsConverted(result, unit_system_converter.as_converter_from_si_to_generic())
result = result.copy()
return result
def new_halogen_model(number_of_particles,
convert_nbody=None,
do_scale=False,
redirection='null',
**keyword_arguments):
"""
Create an alpha-beta-gamma-model using Halogen with the given number of
particles. Returns a set of equal-mass particles self-consistently sampled
from the spherically symmetric density distribution defined by the alpha,
beta, and gamma parameters. The model is centered around the origin.
Positions and velocities are optionally scaled such that the kinetic and
potential energies are 0.25 and -0.5 in nbody-units, respectively.
The alpha, beta, and gamma parameters are (of course) required, but all
other Halogen parameters can be used too, e.g.
new_halogen_model(..., black_hole_mass = 1.0e6 | units.MSun)
will set halogen.parameters.black_hole_mass to this value. See
help(Halogen().parameters) for an overview of the Halogen parameters.
:argument number_of_particles: Number of particles to generate in the model
:argument convert_nbody: When given will convert the resulting set to SI units
:argument do_scale: scale the result to exact nbody units (M=1, K=0.25, U=-0.5)
:argument alpha: alpha parameter in density profile (see amuse/community/halogen/src/doc for details)
:argument beta: beta parameter in density profile (see amuse/community/halogen/src/doc for details)
:argument gamma: gamma parameter in density profile (see amuse/community/halogen/src/doc for details)
"""
instance = Halogen(unit_converter=convert_nbody, redirection=redirection)
instance.parameters.number_of_particles = number_of_particles
for (key, value) in keyword_arguments.items():
setattr(instance.parameters, key, value)
instance.generate_particles()
result = instance.particles.copy()
instance.stop()
result.move_to_center()
if do_scale:
result.scale_to_standard()
if not convert_nbody is None:
result = ParticlesWithUnitsConverted(
result, convert_nbody.as_converter_from_si_to_generic())
result = result.copy()
return result
def new_halogen_model(number_of_particles, convert_nbody = None, do_scale = False,
redirection = 'null', **keyword_arguments):
"""
Create an alpha-beta-gamma-model using Halogen with the given number of
particles. Returns a set of equal-mass particles self-consistently sampled
from the spherically symmetric density distribution defined by the alpha,
beta, and gamma parameters. The model is centered around the origin.
Positions and velocities are optionally scaled such that the kinetic and
potential energies are 0.25 and -0.5 in nbody-units, respectively.
The alpha, beta, and gamma parameters are (of course) required, but all
other Halogen parameters can be used too, e.g.
new_halogen_model(..., black_hole_mass = 1.0e6 | units.MSun)
will set halogen.parameters.black_hole_mass to this value. See
help(Halogen().parameters) for an overview of the Halogen parameters.
:argument number_of_particles: Number of particles to generate in the model
:argument convert_nbody: When given will convert the resulting set to SI units
:argument do_scale: scale the result to exact nbody units (M=1, K=0.25, U=-0.5)
:argument alpha: alpha parameter in density profile (see amuse/community/halogen/src/doc for details)
:argument beta: beta parameter in density profile (see amuse/community/halogen/src/doc for details)
:argument gamma: gamma parameter in density profile (see amuse/community/halogen/src/doc for details)
"""
instance = Halogen(unit_converter=convert_nbody, redirection=redirection)
instance.parameters.number_of_particles = number_of_particles
for (key, value) in keyword_arguments.iteritems():
setattr(instance.parameters, key, value)
instance.generate_particles()
result = instance.particles.copy()
instance.stop()
result.move_to_center()
if do_scale:
result.scale_to_standard()
if not convert_nbody is None:
result = ParticlesWithUnitsConverted(result, convert_nbody.as_converter_from_si_to_generic())
result = result.copy()
return result