def SingleParticleNewtonianForce(self, i, soi_radius, collision_radius):
forces = np.zeros([self.Nparticles,2])
if self.collisions == {}:
keynum = 0
else:
keynum = max(self.collisions)
x1 = self.state[i,0,0]
y1 = self.state[i,0,1]
newkey = (x1,y1)
m1 = self.masses[i]
for particle_num in xrange(self.Nparticles):
if particle_num != i:
m2 = self.masses[particle_num]
x2 = self.state[particle_num,0,0]
y2 = self.state[particle_num,0,1]
distance2 = ((x2-x1)**2+(y2-y1)**2)
if distance2 < soi_radius:
jforce = m2/distance2
jforcedir = [x2-x1,y2-y1]/np.sqrt(distance2)
forces[particle_num] = jforce*jforcedir
if distance2 < collision_radius:
for key in self.collisions:
if i not in self.collisions[key][1] or particle_num not in self.collisions[key][1]:
self.collisions[keynum] = [(x1,y1),[i,particle_num]]
return(np.sum(forces,axis=0))
def SingleParticleNewtonianForce(self, i, soi_radius, collision_radius):
forces = np.zeros([self.Nparticles,2])
x1 = self.state[i,0,0]
y1 = self.state[i,0,1]
m1 = self.masses[i]
collided1 = 0
if self.interaction=='ClassicalNBody':
xmin = x1-soi_radius
xmax = x1+soi_radius
ymin = y1-soi_radius
ymax = y1+soi_radius
sliced_indices_x = np.where(np.logical_and(self.state[:,0,0]>xmin,self.state[:,0,0]<xmax))
sliced_indices_y = np.where(np.logical_and(self.state[:,0,1]>ymin,self.state[:,0,1]<ymax))
sliced_indices = np.intersect1d(sliced_indices_x,sliced_indices_y)
sliced_arr = self.state[sliced_indices]
no_i_indices = np.where(np.logical_and(sliced_arr[:,0,0] == x1,sliced_arr[:,0,1]==y1))
sliced_arr = np.delete(sliced_arr,no_i_indices,axis=0)
sliced_masses = self.masses[sliced_indices]
sliced_masses = np.delete(sliced_masses,no_i_indices,axis=0)
distances2 = np.array(np.transpose(np.matrix((sliced_arr[:,0,0]-x1)**2+(sliced_arr[:,0,1]-y1)**2)))
jforce = np.array(np.transpose(np.matrix(sliced_masses)))/distances2
jforcedir = np.array(np.transpose(np.matrix([sliced_arr[:,0,0]-x1,sliced_arr[:,0,1]-y1])))/np.sqrt(distances2)
forces = jforce*jforcedir
for particle_num in xrange(self.Nparticles):
if particle_num != i:
collided2 = 0
m2 = self.masses[particle_num]
x2 = self.state[particle_num,0,0]
y2 = self.state[particle_num,0,1]
distance2 = ((x2-x1)**2+(y2-y1)**2)
"""
if the collision dict is empty, put in the two particles being evaluated.
if it's not empty, first search to see if the main particle is in there
if the main particle is in there, move on to the secondary
if the secondary particle is not in there, put it in the entry with the main particle
"""
if self.Nparticles == 2:
if distance2>500000:
print('\n',distance2)
print(self.state)
raise ValueError("it f****d the duck")
elif self.Nparticles == 1:
raise ValueError("it shit the bed")
if self.collisions != False and i not in self.cleanup and particle_num not in self.cleanup:
if distance2 < collision_radius:
if self.collision_dict == {}:
self.collision_dict[0] = [(x1,y1),[i,particle_num]]
else:
i_val = farts.dict_check(self.collision_dict, i)
keynum = max(self.collision_dict)+1
if i_val == -1:
self.collision_dict[keynum] = [(x1,y1),[i]]
i_val = keynum
elif farts.dict_check(self.collision_dict, particle_num) == -1:
self.collision_dict[i_val][1].append(particle_num)
return(np.sum(forces,axis=0))
