Tibeuleu/KozaiLidov
1
0
Fork 0
Code Activity

debugg integrator

Browse Source
This commit is contained in:
Thibault Barnouin
2021-10-15 18:42:43 +02:00
parent 69f4233ac3
commit 87108df552
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
lib/integrator.py Normal file → Executable file
View File

@@ -12,14 +12,14 @@ def dp_dt(m_array, q_array):
Time derivative of the momentum, given by the position derivative of the Hamiltonian.
dp/dt = -dH/dq
"""
dp_array = np.zeros((q_array.shape[0],3))
dp_array = np.zeros(q_array.shape)
for i in range(q_array.shape[0]):
m_j = np.delete(m_array)
q_j = np.delete(q_array)
dp_array[i] = m_array[i]*np.sum(m_j*/(q_j-q_array[i])**2, axis=0)
m_j = np.delete(m_array, i)
q_j = np.delete(q_array, i, 0)
dp_array = m_array[i]*np.sum((m_j/np.sum((q_j-q_array[i])**3, axis=1)).reshape((q_j.shape[0],1))*(q_j-q_array[i]), axis=0)
return dp_array
def leapfrog(duration, step, m_array, q_array, p_array):
def frogleap(duration, step, m_array, q_array, p_array):
"""
Leapfrog integrator for first order partial differential equations.
iteration : half-step drift -> full-step kick -> half-step drift