makesnapshot.py
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	#!/usr/bin/env python

	from pNbody import *
	from pNbody import ic

	from optparse import OptionParser


	########################################
	#
	# parser
	#
	########################################

	def parse_options():

	usage = "usage: %prog [options] file"
	parser = OptionParser(usage=usage)


	parser.add_option("-t",
	action="store",
	dest="ftype",
	type="string",
	default = 'simpleformat',
	help="type of the file",
	metavar=" TYPE")

	parser.add_option("-f",
	action="store",
	dest="file",
	type="string",
	default = 'snap.dat',
	help="output file name",
	metavar=" FILE")

	parser.add_option("-n",
	action="store",
	dest="n",
	type="int",
	default = 2**14,
	help="number of particles",
	metavar=" INT")


	(options, args) = parser.parse_args()

	files = args

	return files,options


	#################################
	#
	# main
	#
	#################################


	files,opt = parse_options()



	ftype = opt.ftype
	file = opt.file

	# create file and save it
	nb = ic.expd(n=opt.n,Hr=3.,Hz=0.3,Rmax=20,Zmax=2,irand=1,name=file,ftype=ftype)
	nb.write()

	print "%s as been dumped."%file