def test1(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
smalln = SmallN(convert_nbody)
smalln.initialize_code()
smalln.dt_dia = 5000
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
smalln.particles.add_particles(stars)
smalln.evolve_model(365.0 | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_at_start = earth.position.value_in(units.AU)[0]
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)
smalln.evolve_model(365.0 + (365.0 / 2) | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
smalln.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
smalln.cleanup_code()
smalln.stop()
def test2(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = SmallN(convert_nbody)
instance.initialize_code()
instance.dt_dia = 5000
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
for x in range(1,2000,10):
instance.evolve_model(x | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
stars.savepoint()
if HAS_MATPLOTLIB:
figure = pyplot.figure()
plot = figure.add_subplot(1,1,1)
x_points = earth.get_timeline_of_attribute("x")
y_points = earth.get_timeline_of_attribute("y")
x_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), x_points)
y_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), y_points)
plot.scatter(x_points_in_AU,y_points_in_AU, color = "b", marker = 'o')
plot.set_xlim(-1.5, 1.5)
plot.set_ylim(-1.5, 1.5)
test_results_path = self.get_path_to_results()
output_file = os.path.join(test_results_path, "smalln-earth-sun2.svg")
figure.savefig(output_file)
instance.cleanup_code()
instance.stop()
def test2(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun,
149.5e6 | units.km)
instance = SmallN(convert_nbody)
instance.initialize_code()
instance.dt_dia = 5000
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
for x in range(1, 2000, 10):
instance.evolve_model(x | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
stars.savepoint()
if HAS_MATPLOTLIB:
figure = pyplot.figure()
plot = figure.add_subplot(1, 1, 1)
x_points = earth.get_timeline_of_attribute("x")
y_points = earth.get_timeline_of_attribute("y")
x_points_in_AU = [t_x[1].value_in(units.AU) for t_x in x_points]
y_points_in_AU = [t_x1[1].value_in(units.AU) for t_x1 in y_points]
plot.scatter(x_points_in_AU, y_points_in_AU, color="b", marker='o')
plot.set_xlim(-1.5, 1.5)
plot.set_ylim(-1.5, 1.5)
test_results_path = self.get_path_to_results()
output_file = os.path.join(test_results_path,
"smalln-earth-sun2.svg")
figure.savefig(output_file)
instance.cleanup_code()
instance.stop()
def test1(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun,
149.5e6 | units.km)
smalln = SmallN(convert_nbody)
smalln.initialize_code()
smalln.dt_dia = 5000
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
smalln.particles.add_particles(stars)
smalln.evolve_model(365.0 | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_at_start = earth.position.value_in(units.AU)[0]
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation,
6)
smalln.evolve_model(365.0 + (365.0 / 2) | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(-position_at_start,
position_after_half_a_rotation, 2)
smalln.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
smalln.particles.copy_values_of_all_attributes_to(stars)
position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
self.assertAlmostEqual(-position_at_start,
position_after_half_a_rotation, 3)
smalln.cleanup_code()
smalln.stop()