def evolve_system(particles):
"""
Evolves the system using the Hermite integrator.
Parameters
----------
particles: amuse.datamodel.particles.Particles instance
"""
times = numpy.linspace(0.0001, args.time, args.steps) | u.yr
intr = Hermite(nbody_to_si(particles.total_mass(), 1 | u.AU))
intr.particles.add_particles(particles)
energy_begin = intr.get_total_energy()
if args.dt is not None:
intr.set_dt_param(args.dt)
for t in times:
intr.evolve_model(t)
energy_error = (intr.get_total_energy() - energy_begin) / energy_begin
print(intr.get_time_step().in_(u.day), intr.get_time().in_(u.yr))
print(energy_error)
print("energy error:{}".format(energy_error))
intr.stop()
def evolve_system(particles):
"""
Evolves the system using the Hermite integrator.
Parameters
----------
particles: amuse.datamodel.particles.Particles instance
"""
times = numpy.linspace(0.0001, args.time, args.steps) |u.yr
intr = Hermite(nbody_to_si(particles.total_mass(), 1 | u.AU))
intr.particles.add_particles(particles)
energy_begin = intr.get_total_energy()
if args.dt is not None:
intr.set_dt_param(args.dt)
for t in times:
intr.evolve_model(t)
energy_error = (intr.get_total_energy() - energy_begin)/energy_begin
print(intr.get_time_step().in_(u.day), intr.get_time().in_(u.yr))
print(energy_error)
print("energy error:{}".format(energy_error))
intr.stop()
