gmktimesteps
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	#!/usr/bin/env python
	'''
	Create a liste of cosmological timesteps in
	the form of parameter a.

	Yves Revaz
	ven avr 14 12:35:53 CEST 2006

	'''

	from optparse import OptionParser
	import sys



	def parse_options():

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


	parser.add_option("-p",
	action="store",
	dest="p",
	type='int',
	default=5,
	metavar=" INT",
	help="precision value")

	parser.add_option("-v",
	action="store_true",
	dest="verbose",
	default = 0,
	help="verbose mode")


	(options, args) = parser.parse_args()


	files = args

	return files,options



	##########################################################
	#
	# MAIN
	#
	#########################################################


	# get options
	files,options = parse_options()

	p = options.p
	verbose = options.verbose


	da = 1./(2.**p)
	a = 0

	while 1:

	a = a + da
	z = 1./a - 1.0

	if z < 0:
	break

	if verbose:
	print "a = %12.10f z = %12.8f"%(a,z)
	else:
	print "%12.10f"%(a)