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gbinary2gadget
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Tue, Nov 26, 01:04

gbinary2gadget
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#!/usr/bin/env python
'''
Convert binary(pfen) file into gadget file
Yves Revaz
mar oct 17 17:35:35 CEST 2006
'''
from Nbody import *
import string
from optparse import OptionParser
import sys
def toarray(s):
n = 13
a = []
for i in range(6):
a.append(float(s[i*n:(i+1)*n]))
return a
def parse_options():
usage = "usage: %prog [options] file"
parser = OptionParser(usage=usage)
parser.add_option("-o",
action="store",
dest="outputfile",
type="string",
default = None,
help="output file",
metavar=" FILE")
parser.add_option("--ng",
action="store",
dest="ng",
type="int",
default = 0,
help="number of gaseous particles",
metavar=" INT")
parser.add_option("--ns",
action="store",
dest="ns",
type="int",
default = 0,
help="number of star particles",
metavar=" INT")
parser.add_option("--nd",
action="store",
dest="nd",
type="int",
default = 0,
help="number of dark particles",
metavar=" INT")
parser.add_option("--mtot",
action="store",
dest="mtot",
type="float",
default = 1.0,
help="total mass in code unit",
metavar=" FLOAT")
parser.add_option("--u0",
action="store",
dest="u0",
type="float",
default = 0.0,
help="internal energy of gaz particles",
metavar=" FLOAT")
(options, args) = parser.parse_args()
if len(args) == 0:
print "you must specify a filename"
sys.exit(0)
files = args
return files,options
#############################
# main
#############################
# get options
files,options = parse_options()
ng = options.ng
ns = options.ns
nd = options.nd
mtot = options.mtot
u0 = options.u0
outputfile = options.outputfile
try:
nb = Nbody(files[0],ftype='binary')
except "ReadError":
nb = Nbody(files[0],ftype='binary_dis')
nb = nb.set_ftype('gadget')
n = nb.nbody
if (ng==0) and (nd==0) and (ns==0):
nd = n
if (ng+nd+ns != n):
print "promblem !"
print "tot number of particles = %d"%(n)
print "ng+nd+ns = %d"%(ng+nd+ns)
print "ng = %d"%(ng)
print "nd = %d"%(nd)
print "ns = %d"%(ns)
sys.exit()
fg =(ng!=0)
fd =(nd!=0)
fs =(ns!=0)
nb.npart =[ng,nd,0,0,ns,0]
nb.massarr=[mtot/n*fg,mtot/n*fd,0,0,mtot/n*fs,0]
nb.nzero = 0
if (ng!=0):
# set specific energy gas particles
u0 = 1.
nb.u = u0*ones(n)
nb.rename(outputfile)
nb.write()

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