test02.py
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	from pNbody import *
	import time
	import treelib

	import Ptools as pt

	ErrTolTheta = 0.8
	eps = 0.1

	# open a model
	nb = Nbody("../../examples/snap.dat",ftype='gadget')
	#nb = nb.selectc(nb.rxyz()<2)

	# create a tree object
	MyTree = treelib.Tree(npart=array(nb.npart),pos=nb.pos,vel=nb.vel,mass=nb.mass,ErrTolTheta=ErrTolTheta)


	R = arange(-20,20,0.1)
	print len(R)
	pos = concatenate((R,zeros(len(R)),zeros(len(R))))
	pos.shape = (3,len(R))
	pos = transpose(pos)
	pos = pos.astype(float32)



	acc = MyTree.Acceleration(pos,eps)


	pt.plot(R,acc[:,0])
	pt.show()