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gplot_r-vcirc
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Sat, Feb 1, 09:51

gplot_r-vcirc
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#!/home/revaz/local/bin/python
'''
Plot circular velocity curve of the model as a function of radius
Rotation curve is derived from the mass inside a certain radius,
assuming a sperical density distribution.
Yves Revaz
ven avr 14 16:17:32 CEST 2006
'''
from numarray import *
from pNbody import *
from pNbody import cosmo
import SM
import string
import sys
import os
from libjeans import *
from pNbody.libutil import histogram
from optparse import OptionParser
from Gtools import *
from Gtools import vanderwaals as vw
def parse_options():
usage = "usage: %prog [options] file"
parser = OptionParser(usage=usage)
parser = add_postscript_options(parser)
parser = add_color_options(parser)
parser = add_limits_options(parser)
parser = add_units_options(parser)
parser = add_log_options(parser)
parser = add_reduc_options(parser)
parser = add_center_options(parser)
parser = add_select_options(parser)
parser.add_option("-t",
action="store",
dest="ftype",
type="string",
default = None,
help="type of the file",
metavar=" TYPE")
parser.add_option("--rmax",
action="store",
dest="rmax",
type="float",
default = 50,
help="max radius",
metavar=" FLOAT")
parser.add_option("--nbins",
action="store",
dest="nbins",
type="int",
default=25,
help="number of bins")
parser.add_option("--cgs",
action="store_true",
dest="cgs",
default = 0,
help="invert into cgs units")
(options, args) = parser.parse_args()
if options.colors!=None:
exec("options.colors = array([%s])"%(options.colors))
if len(args) == 0:
print "you must specify a filename"
sys.exit(0)
files = args
return files,options
#############################
# graph
#############################
# get options
files,options = parse_options()
ps = options.ps
col = options.colors
xmin = options.xmin
xmax = options.xmax
ymin = options.ymin
ymax = options.ymax
log = options.log
reduc = options.reduc
center = options.center
select = options.select
cgs = options.cgs
ftype = options.ftype
rmax = options.rmax
nbins = options.nbins
localsystem = Set_SystemUnits_From_Options(options)
localsystem.get_UnitDensity_in_cgs()
#######################################
# define output system of unit
#######################################
outputunits = units.UnitSystem('mks',[units.Unit_kpc, units.Unit_Ms, units.Unit_yr , units.Unit_K, units.Unit_mol, units.Unit_C])
#######################################
# open sm
#######################################
g = Graph_Init(ps)
Graph_SetDefaultsGraphSettings(g)
colors = Graph_SetColorsForFiles(files,col)
#######################################
# LOOP
#######################################
# read files
for file in files:
nb = Nbody(file,ftype=ftype)
# set unit parameter
nb.localsystem_of_units = localsystem
# center the model
if center=='hdcenter':
print "centering %s"%(center)
nb.hdcenter()
elif center=='histocenter':
print "centering %s"%(center)
nb.histocenter()
# select
if select!=None:
print "select %s"%(select)
nb = nb.select(select)
if reduc!= None:
print "reducing %s"%(reduc)
nb = nb.reduc(reduc)
# get values
x,y = nb.mr(nb=nbins,rm=rmax)
# remove problematic values
c = (x!=0)
x = compress(c,x)
y = compress(c,y)
# compute vc
G = ctes.GRAVITY.into(nb.localsystem_of_units)
y = sqrt(G*y/x)
'''
if cgs:
z = Length2cgs(x,units)
y = Mass2cgs(y,units)
G = 6.672e-8 # in cgs
x = x[1:]
y = sqrt(G*y[1:]/z[1:])
else:
G = 43007.1 # in local units
x = x[1:]
y = sqrt(G*y[1:]/x)
'''
# use log
if log != None:
x,y = Graph_UseLog(x,y,log)
if file == files[0]:
Graph_SetLimits(g,xmin,xmax,ymin,ymax,x,y)
g.box()
# plot points
g.ctype(colors[file])
g.connect(x,y)
g.ctype(0)
if log == 'xy' or log == 'yx':
g.xlabel('log R')
g.ylabel('log Velocity')
elif log == 'x':
g.xlabel('log R')
g.ylabel('Velocity')
elif log == 'y':
g.xlabel('R')
g.ylabel('log Velocity')
else:
g.xlabel('R')
g.ylabel('Velocity')
# -- end ---
Graph_End(g,ps)

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