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add cython version of nbody problem #8

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add cython version of nbody problem #8

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5 changes: 5 additions & 0 deletions nbody/cython/cython_c/nbody/__init__.py
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from . import physics
from .init import init_solar_system, init_collisions
from .time_schemes.euler import Euler
from .time_schemes.rk4 import RK4
from .time_schemes.adb6 import ADB6
2 changes: 2 additions & 0 deletions nbody/cython/cython_c/nbody/barnes_hut_array/__init__.py
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from .energy import compute_energy
from .quadTree import quadArray
15 changes: 15 additions & 0 deletions nbody/cython/cython_c/nbody/barnes_hut_array/energy.py
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import numpy as np
from .quadTree import quadArray

def compute_energy(mass, particles, energy):
bmin = np.min(particles[: ,:2], axis=0)
bmax = np.max(particles[: ,:2], axis=0)
root = quadArray(bmin, bmax, particles.shape[0])

root.buildTree(particles)
root.computeMassDistribution(particles, mass)
for i in range(particles.shape[0]):
acc = root.computeForce(particles[i])
energy[i, 2:] = acc
energy[:, :2] = particles[:, 2:]
print(energy)
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