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gbinary_dis2gadget
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Sat, Feb 8, 05:32

gbinary_dis2gadget
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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("--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()
mtot = options.mtot
u0 = options.u0
outputfile = options.outputfile
nb = Nbody(files[0],ftype='binary_dis')
nb_wg = nb.subdis('wg')
nb_dg = nb.subdis('dg')
nb_sn = nb.subdis('nst')
nb_st = nb.subdis('st',10000)
nwg = nb_wg.nbody
ndg = nb_dg.nbody
nsn = 0
nst = nb_st.nbody
fwg=fdg=fsn=fst=0.
nb = nb.set_ftype('gadget')
n = nb.nbody
if nwg!=0:
fwg = 1
nb.pos = nb_wg.pos
nb.vel = nb_wg.vel
if ndg!=0:
fdg = 1
nb.pos = concatenate((nb.pos,nb_dg.pos))
nb.vel = concatenate((nb.vel,nb_dg.vel))
if nsn!=0:
fsn = 1
nb.pos = concatenate((nb.pos,nb_sn.pos))
nb.vel = concatenate((nb.vel,nb_sn.vel))
if nst!=0:
fst = 1
nb.pos = concatenate((nb.pos,nb_st.pos))
nb.vel = concatenate((nb.vel,nb_st.vel))
nb.npart =[nwg,ndg,0,nsn,nst,0]
nb.massarr=[mtot/n*fwg,mtot/n*fdg,0,mtot/n*fsn,mtot/n*fst,0]
nb.nzero = 0
if (nwg!=0):
# set specific energy gas particles
u0 = 1.
nb.u = u0*ones(n)
nb.rename(outputfile)
nb.write()

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