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()