def test8(self):
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(list(range(1, 7)))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0, 0.0, 0.0], [1.0, 0.0, 0.0],
[0.0, -1.0, 0.0], [0.0, 1.0, 0.0],
[0.0, 0.0, -1.0], [0.0, 0.0, 1.0]
] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [
0.0, 0.0, 0.0
], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0], [0.0, 0.0, 0.0]
] | nbody_system.speed
for current_mode in ['g6lib', 'gpu', 'grape']:
try:
instance = PhiGRAPE(mode=current_mode)
except:
print("Running PhiGRAPE with mode=" + current_mode,
"was unsuccessful.")
else:
print("Running PhiGRAPE with mode=" + current_mode + "...",
end=' ')
instance.initialize_code()
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.1 | nbody_system.time)
instance.cleanup_code()
instance.stop()
print("ok")
def new_star_code_phigrape(self):
result = PhiGRAPE(mode="gpu")
result.parameters.initialize_gpu_once = 1
result.parameters.epsilon_squared = self.star_epsilon**2
result.particles.add_particles(self.new_particles_cluster())
result.commit_particles()
return result
def test7(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = [0.0, 0.0, 0.0] | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)
n = 512
x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
zero = nbody_system.length.new_quantity(numpy.zeros(n))
fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
for i in range(n//2):
self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)
instance.stop()
def test1(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)#, debugger="xterm")
instance.initialize_code()
instance.parameters.set_defaults()
instance.parameters.initial_timestep_parameter = 0.001
instance.parameters.timestep_parameter = 0.001
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
position_at_start = earth.position.value_in(units.AU)[0]
instance.evolve_model(365 | units.day)
instance.particles.copy_values_of_all_attributes_to(stars)
position_after_full_rotation = earth.position.value_in(units.AU)[0]
self.assertAlmostEqual(position_at_start, position_after_full_rotation, 2)
instance.evolve_model(365.0 + (365.0 / 2) | units.day)
instance.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)
instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4) | units.day)
instance.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)
instance.cleanup_code()
instance.stop()
def test16(self):
instance = PhiGRAPE(number_of_workers=2, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
print(1)
particles = datamodel.Particles(2)
particles.x = [-1.0, 1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = [1.0, 0.5] | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertAlmostRelativeEquals(instance.particles[0].position.x,
-0.999984741095 | nbody_system.length,
8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.999969482189 | nbody_system.length,
8)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertAlmostRelativeEquals(instance.particles[0].position.x,
-0.999022960148 | nbody_system.length,
8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.998045920305 | nbody_system.length,
8)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertAlmostRelativeEquals(instance.particles[0].position.x,
-0.984250788742 | nbody_system.length,
8)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.968501583383 | nbody_system.length,
8)
instance.cleanup_code()
instance.stop()
def test15(self):
instance = PhiGRAPE(number_of_workers=2,
**default_test_options) #, redirection = "none")
instance.initialize_code()
instance.parameters.set_defaults()
print(1)
particles = datamodel.Particles(2)
particles.x = [-1.0, 1.0] | nbody_system.length
particles.y = 0 | nbody_system.length
particles.z = 0 | nbody_system.length
particles.radius = 0.005 | nbody_system.length
particles.vx = 0 | nbody_system.speed
particles.vy = 0 | nbody_system.speed
particles.vz = 0 | nbody_system.speed
particles.mass = 1.0 | nbody_system.mass
instance.particles.add_particles(particles)
instance.commit_particles()
instance.evolve_model(0.01 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertEqual(instance.particles[0].position.x,
-instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.999969482111 | nbody_system.length,
6)
instance.evolve_model(0.10 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertEqual(instance.particles[0].position.x,
-instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.99804560161 | nbody_system.length, 6)
instance.evolve_model(0.50 | nbody_system.time)
instance.particles.copy_values_of_all_attributes_to(particles)
print(instance.particles.position.x)
self.assertEqual(instance.particles[0].position.x,
-instance.particles[1].position.x)
self.assertAlmostRelativeEquals(instance.particles[1].position.x,
0.968416814302 | nbody_system.length,
6)
instance.cleanup_code()
instance.stop()
def test6(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(6)
particles.mass = nbody_system.mass.new_quantity(range(1,7))
particles.radius = 0.00001 | nbody_system.length
particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
copyof = instance.particles.copy()
self.assertEquals(2 | nbody_system.mass, copyof[1].mass)
instance.stop()
def test5(self):
instance = PhiGRAPE(**default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
particles = datamodel.Particles(2)
particles.mass = [1.0, 1.0] | nbody_system.mass
particles.radius = [0.0001, 0.0001] | nbody_system.length
particles.position = [[0.0, 0.0, 0.0], [2.0, 0.0, 0.0]
] | nbody_system.length
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]
] | nbody_system.speed
instance.particles.add_particles(particles)
instance.commit_particles()
zero = 0.0 | nbody_system.length
fx, fy, fz = instance.get_gravity_at_point(zero,
1.0 | nbody_system.length,
zero, zero)
self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
for x in (0.25, 0.5, 0.75):
x0 = x | nbody_system.length
x1 = (2.0 - x) | nbody_system.length
potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)
self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)
self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
fx = (-1.0 / (x0**2) + 1.0 /
(x1**2)) * (1.0
| nbody_system.length**3 / nbody_system.time**2)
self.assertAlmostEqual(fx, fx0, 2)
self.assertAlmostEqual(potential0, potential1, 5)
instance.stop()
def test2(self):
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun,
149.5e6 | units.km)
instance = PhiGRAPE(convert_nbody, **default_test_options)
instance.initialize_code()
instance.parameters.set_defaults()
stars = self.new_system_of_sun_and_earth()
earth = stars[1]
instance.particles.add_particles(stars)
instance.commit_particles()
for x in range(1, 365, 30):
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,
"phiGRAPE-earth-sun2.svg")
figure.savefig(output_file)
instance.cleanup_code()
instance.stop()