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gZtoGyr
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Fri, Nov 22, 16:25

gZtoGyr
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#!/usr/bin/env python
from optparse import OptionParser
import Ptools as pt
from pNbody import *
from pNbody import units
from pNbody import ctes
from pNbody import thermodyn
import string
from scipy import optimize
# DlogA = da / a
#
def parse_options():
usage = "usage: %prog [options] file"
parser = OptionParser(usage=usage)
parse = pt.add_units_options(parser)
parser.add_option("-Z",
action="store",
dest="Z",
type="float",
default = 0.,
help="Redshift",
metavar=" FLOAT")
(options, args) = parser.parse_args()
#pt.check_files_number(args)
files = args
return files,options
#######################################
# MakePlot
#######################################
def MakePlot(files,opt):
# define local units
unit_params = pt.do_units_options(opt)
system_of_units = units.Set_SystemUnits_From_Params(unit_params)
# convert a to Myrs
out_units = units.UnitSystem('local',[units.Unit_cm,units.Unit_Msol,units.Unit_Gyr,units.Unit_K])
hubbleparam = unit_params["HubbleParam"]
omegalambda = unit_params["OmegaLambda"]
omega0 = unit_params["Omega0"]
Hubble = ctes.HUBBLE.into(system_of_units)
pars = {"Hubble":Hubble,"HubbleParam":hubbleparam,"OmegaLambda":omegalambda,"Omega0":omega0}
funit = system_of_units.convertionFactorTo(out_units.UnitTime)
a = cosmo.A_z(opt.Z)
TMyr = cosmo.CosmicTime_a(a,pars) / hubbleparam * funit
print "Z = %8.6f a = %8.6f = %10.4f [Gyr]"%(opt.Z,a,TMyr)
########################################################################
# MAIN
########################################################################
if __name__ == '__main__':
files,opt = parse_options()
MakePlot(files,opt)

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