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pNbody/src/PyGadget/examples/test_AllAcceleration.py
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test_AllAcceleration.py
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#!/usr/bin/env python
from mpi4py import MPI
from pNbody import ic
from numpy import *
from PyGadget import gadget
import Ptools as pt
import sys
import time
random.seed(MPI.COMM_WORLD.Get_rank()) # 2 for two points
n = 10000
rc = 2
rmax = 100
nb = ic.plummer(n,1,1,1,eps=rc,rmax=rmax,ftype='gadget')
nb.rename('plummer.dat')
nb.write()
gadget.InitMPI() # init MPI
gadget.InitDefaultParameters() # init default parameters
gadget.Info()
params = {}
params['ErrTolTheta'] = 0.7
params['DesNumNgb'] = 50
params['MaxNumNgbDeviation'] = 1
params['UnitLength_in_cm'] = 3.085e+21
params['UnitMass_in_g'] = 4.435693e+44
params['UnitVelocity_in_cm_per_s'] = 97824708.2699
params['SofteningGas'] = rc/100.
params['SofteningHalo'] = rc/100.
params['SofteningDisk'] = rc/100.
params['SofteningBulge'] = rc/100.
params['SofteningStars'] = rc/100.
params['SofteningBndry'] = rc/100.
params['SofteningGasMaxPhys'] = rc/100.
params['SofteningHaloMaxPhys'] = rc/100.
params['SofteningDiskMaxPhys'] = rc/100.
params['SofteningBulgeMaxPhys'] = rc/100.
params['SofteningStarsMaxPhys'] = rc/100.
params['SofteningBndryMaxPhys'] = rc/100.
gadget.SetParameters(params)
params = gadget.GetParameters()
gadget.LoadParticles(array(nb.npart),nb.pos,nb.vel,nb.mass,nb.num,nb.tpe)
#gadget.AllPotential()
print "start accel"
gadget.AllAcceleration()
print "done accel"
#pot = gadget.GetAllPotential()
acc = gadget.GetAllAcceleration()
nb.pos = gadget.GetAllPositions()
###############################
# plot
###############################
r = nb.rxyz()
val = sqrt(acc[:,0]**2 + acc[:,1]**2 + acc[:,2]**2)
pt.scatter(r,val,s=1)
pt.show()
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