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Square cells and merging numba/python versions of nbody/init.py #5

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fd39907
Using squared cells in quadTree.
rolanddenis Dec 1, 2017
2da5b53
Fixing initial cell radius.
rolanddenis Dec 1, 2017
017e452
Merging python and numba versions of nbody/init.py
rolanddenis Dec 1, 2017
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20 changes: 10 additions & 10 deletions nbody/numba/nbody/barnes_hut_array/numba_functions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ def buildTree(center0, box_size0, child, cell_center, cell_radius, particles):
nbodies = particles.shape[0]
for ip in range(nbodies):
center = center0.copy()
box_size = box_size0.copy()
box_size = box_size0
x, y = particles[ip, :2]
cell = 0

Expand Down Expand Up @@ -44,15 +44,15 @@ def buildTree(center0, box_size0, child, cell_center, cell_radius, particles):
ncell += 1
child[childIndex] = nbodies + ncell
center[:] = cell_center[cell]
box_size[:] = .5*cell_radius[cell]
box_size = .5*cell_radius[cell]
if (oldchildPath&1):
center[0] += box_size[0]
center[0] += box_size
else:
center[0] -= box_size[0]
center[0] -= box_size
if ((oldchildPath>>1)&1):
center[1] += box_size[1]
center[1] += box_size
else:
center[1] -= box_size[1]
center[1] -= box_size

oldchildPath = 0
if particles[npart, 0] > center[0]:
Expand Down Expand Up @@ -110,9 +110,9 @@ def buildTree(center0, box_size0, child, cell_center, cell_radius, particles):
# acc += np.array([F * dx, F * dy])
# else:
# dist = np.sqrt(dx**2 + dy**2)
# #print(dist, localNode[depth], self.cell_radius[child - self.nbodies][0],
# # self.cell_radius[child - self.nbodies][0]/dist)
# if dist != 0 and cell_radius[child - nbodies][0]/dist <.5:
# #print(dist, localNode[depth], self.cell_radius[child - self.nbodies],
# # self.cell_radius[child - self.nbodies]/dist)
# if dist != 0 and cell_radius[child - nbodies]/dist <.5:
# #print('dist', dx, dy)
# F = gamma_si*mass[child]/(dist*dist*dist)
# acc += np.array([F * dx, F * dy])
Expand Down Expand Up @@ -146,7 +146,7 @@ def computeForce(nbodies, child_array, center_of_mass, mass, cell_radius, p):
dx = center_of_mass[child, 0] - pos[0]
dy = center_of_mass[child, 1] - pos[1]
dist = np.sqrt(dx**2 + dy**2)
if dist != 0 and cell_radius[child - nbodies][0]/dist <.5:
if dist != 0 and cell_radius[child - nbodies]/dist <.5:
Fx, Fy = force(pos, center_of_mass[child], mass[child])
acc[0] += Fx
acc[1] += Fy
Expand Down
6 changes: 3 additions & 3 deletions nbody/numba/nbody/barnes_hut_array/quadTree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,12 +9,12 @@ def __init__(self, bmin, bmax, size):
self.bmin = np.asarray(bmin)
self.bmax = np.asarray(bmax)
self.center = .5*(self.bmin + self.bmax)
self.box_size = (self.bmax - self.bmin)
self.box_size = (self.bmax - self.bmin).max()
self.ncell = 0
self.cell_center = np.zeros((2*size+1, 2))
self.cell_radius = np.zeros((2*size+1, 2))
self.cell_radius = np.zeros(2*size+1)
self.cell_center[0] = self.center
self.cell_radius[0] = self.box_size
self.cell_radius[0] = 0.5*self.box_size

def buildTree(self, particles):
self.ncell = numba_functions.buildTree(self.center, self.box_size, self.child, self.cell_center, self.cell_radius, particles)
Expand Down
20 changes: 10 additions & 10 deletions nbody/python/nbody/barnes_hut_array/quadTree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,17 +8,17 @@ def __init__(self, bmin, bmax, size):
self.bmin = np.asarray(bmin)
self.bmax = np.asarray(bmax)
self.center = .5*(self.bmin + self.bmax)
self.box_size = (self.bmax - self.bmin)
self.box_size = (self.bmax - self.bmin).max()
self.ncell = 0
self.cell_center = np.zeros((2*size+1, 2))
self.cell_radius = np.zeros((2*size+1, 2))
self.cell_radius = np.zeros(2*size+1)
self.cell_center[0] = self.center
self.cell_radius[0] = self.box_size
self.cell_radius[0] = 0.5*self.box_size

def buildTree(self, particles):
for ip, p in enumerate(particles):
center = self.center.copy()
box_size = self.box_size.copy()
box_size = self.box_size
x, y = p[:2]
cell = 0

Expand Down Expand Up @@ -55,13 +55,13 @@ def buildTree(self, particles):
center[:] = self.cell_center[cell]
box_size = .5*self.cell_radius[cell]
if (oldchildPath&1):
center[0] += box_size[0]
center[0] += box_size
else:
center[0] -= box_size[0]
center[0] -= box_size
if ((oldchildPath>>1)&1):
center[1] += box_size[1]
center[1] += box_size
else:
center[1] -= box_size[1]
center[1] -= box_size

oldchildPath = 0
if particles[npart][0] > center[0]:
Expand Down Expand Up @@ -125,7 +125,7 @@ def computeForce(self, p):
dx = self.center_of_mass[child, 0] - pos[0]
dy = self.center_of_mass[child, 1] - pos[1]
dist = np.sqrt(dx**2 + dy**2)
if dist != 0 and self.cell_radius[child - self.nbodies][0]/dist <.5:
if dist != 0 and self.cell_radius[child - self.nbodies]/dist <.5:
F = force(pos, self.center_of_mass[child], self.mass[child])
acc += F
else:
Expand All @@ -146,4 +146,4 @@ def __str__(self):
s += 2*indent + 'particules: {p}\n'.format(p=cellElements[np.logical_and(0<=cellElements, cellElements<self.nbodies)])
s += 2*indent + 'cells: {c}\n'.format(c=cellElements[cellElements>=self.nbodies]-self.nbodies)

return s
return s
10 changes: 5 additions & 5 deletions nbody/python/nbody/init.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import numpy as np
from .physics import gamma_1
from .physics import gamma_1, gamma_si

def init_solar_system():
bodies = np.array([[ 0, 0, 0, 0], #sun
Expand Down Expand Up @@ -33,7 +33,7 @@ def getOrbitalVelocity(xb, yb, mb, xs, ys):
dist = np.sqrt(r[0] * r[0] + r[1] * r[1])

# Based on the distance from the sun calculate the velocity needed to maintain a circular orbit
v = np.sqrt(gamma_1 * mb / dist)
v = np.sqrt(gamma_si * mb / dist)

# Calculate a suitable vector perpendicular to r for the velocity of the tracer
vxs = ( r[1] / dist) * v
Expand Down Expand Up @@ -65,7 +65,7 @@ def init_collisions(blackHole):

nstars = b['stars']
rad = b['radstars']
r = 0.1 + .8 * (rad * np.random.rand(nstars))
r = 0.3 + .8 * (rad * np.random.rand(nstars))
a = 2*np.pi*np.random.rand(nstars)
tmp_mass = 0.03 + 20*np.random.rand(nstars)
x = b['coord'][0] + r*np.sin(a)
Expand All @@ -75,8 +75,8 @@ def init_collisions(blackHole):

particles[ind:ind+nstars, 0] = x
particles[ind:ind+nstars, 1] = y
particles[ind:ind+nstars, 2] = 1e2 * (vx + vxb)
particles[ind:ind+nstars, 3] = 1e2 * (vy + vyb)
particles[ind:ind+nstars, 2] = vx + vxb
particles[ind:ind+nstars, 3] = vy + vyb
mass[ind:ind+nstars] = tmp_mass
ind += nstars

Expand Down