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pytipsy.py
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pytipsy.py
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import re
import struct
import numpy as np
def rtipsy(filename, VERBOSE=False):
"""rtipsy Reads tipsy files detecting the format:
big endian, little endian, padded (standard) or non-padded header
Usage:
rtipsy(filename, VERBOSE=False)
Input parameters:
filename filename string
VERBOSE print messages (optional)
Return values:
(header,g,d,s)
header tipsy header struct
g,d,s gas, dark and star structures
Please read rtipsy.py for the structure definitions
Example:
h,g,d,s = rtipsy('/home/wadsley/usr5/mihos/mihos.std')
print, h['ndark']
plt.plot(d['x'], d['y'], 'k,')"""
try:
f = open(filename, 'rb')
except:
print("RTIPSY ERROR: Can't open file")
return 1
fs = len(f.read())
f.seek(0)
#Read in the header
t, n, ndim, ng, nd, ns = struct.unpack("<diiiii", f.read(28))
endianswap = False
#Check Endianness
if (ndim < 1 or ndim > 3):
endianswap = True
f.seek(0)
t, n, ndim, ng, nd, ns = struct.unpack(">diiiii", f.read(28))
if VERBOSE:
print("SWAP_ENDIAN")
if VERBOSE:
print("Read time,n,ngas,ndark,nstar: ", t, n, ng, nd, ns)
#Catch for 4 byte padding
if (fs == 32+48*ng+36*nd+44*ns):
f.read(4)
#File is borked if this is true
elif (fs != 28+48*ng+36*nd+44*ns):
print("RTIPSY ERROR: Header and file size inconsistent")
print("Estimates: Header bytes: 28 or 32 (either is OK)")
print(" ngas: ",ng," bytes:",48*ng)
print(" ndark: ",nd," bytes:",36*nd)
print(" nstar: ",ns," bytes:",44*ns)
print("Actual File bytes:",fs," not one of:",28+48*ng+36*nd+44*ns,32+48*ng+36*nd+44*ns)
f.close()
return 1
catg = {'mass':np.zeros(ng), 'pos':np.zeros((ng,3)), 'vel':np.zeros((ng,3)), 'dens':np.zeros(ng),
'tempg':np.zeros(ng), 'h':np.zeros(ng), 'zmetal':np.zeros(ng), 'phi':np.zeros(ng)}
catd = {'mass':np.zeros(nd), 'pos':np.zeros((nd,3)), 'vel':np.zeros((nd,3)),
'eps':np.zeros(nd), 'phi':np.zeros(nd)}
cats = {'mass':np.zeros(ns), 'pos':np.zeros((ns,3)), 'vel':np.zeros((ns,3)),
'metals':np.zeros(ns), 'tform':np.zeros(ns), 'eps':np.zeros(ns), 'phi':np.zeros(ns)}
for cat in ['g','d','s']:
j = 0
for qty in ['x','y','z']:
locals()['cat'+cat][qty] = locals()['cat'+cat]['pos'][:,j]
locals()['cat'+cat]['v'+qty] = locals()['cat'+cat]['vel'][:,j]
j += 1
if (ng > 0):
for i in range(ng):
if endianswap:
mass, x, y, z, vx, vy, vz, dens, tempg, h, zmetal, phi = struct.unpack(">ffffffffffff", f.read(48))
else:
mass, x, y, z, vx, vy, vz, dens, tempg, h, zmetal, phi = struct.unpack("<ffffffffffff", f.read(48))
catg['mass'][i] = mass
catg['x'][i] = x
catg['y'][i] = y
catg['z'][i] = z
catg['vx'][i] = vx
catg['vy'][i] = vy
catg['vz'][i] = vz
catg['dens'][i] = dens
catg['tempg'][i] = tempg
catg['h'][i] = h
catg['zmetal'][i] = zmetal
catg['phi'][i] = phi
if (nd > 0):
for i in range(nd):
if endianswap:
mass, x, y, z, vx, vy, vz, eps, phi = struct.unpack(">fffffffff", f.read(36))
else:
mass, x, y, z, vx, vy, vz, eps, phi = struct.unpack("<fffffffff", f.read(36))
catd['mass'][i] = mass
catd['x'][i] = x
catd['y'][i] = y
catd['z'][i] = z
catd['vx'][i] = vx
catd['vy'][i] = vy
catd['vz'][i] = vz
catd['eps'][i] = eps
catd['phi'][i] = phi
if (ns > 0):
for i in range(ns):
if endianswap:
mass, x, y, z, vx, vy, vz, metals, tform, eps, phi = struct.unpack(">fffffffffff", f.read(44))
else:
mass, x, y, z, vx, vy, vz, metals, tform, eps, phi = struct.unpack("<fffffffffff", f.read(44))
cats['mass'][i] = mass
cats['x'][i] = x
cats['y'][i] = y
cats['z'][i] = z
cats['vx'][i] = vx
cats['vy'][i] = vy
cats['vz'][i] = vz
cats['metals'][i] = metals
cats['tform'][i] = tform
cats['eps'][i] = eps
cats['phi'][i] = phi
header = {'time':t, 'n':n, 'ndim':ndim, 'ngas':ng, 'ndark':nd, 'nstar':ns}
return (header,catg,catd,cats)
def wtipsy(filename, header, catg, catd, cats, STANDARD=True):
try:
f = open(filename, 'wb')
except:
print("WTIPSY ERROR: Can't open file")
return 1
f.write(struct.pack(">diiiii", header['time'], header['n'], header['ndim'], header['ngas'], header['ndark'], header['nstar']))
if STANDARD:
f.write(struct.pack("xxxx"))
for i in range(header['ngas']):
f.write(struct.pack(">ffffffffffff", catg['mass'][i], catg['x'][i], catg['y'][i], catg['z'][i], catg['vx'][i], catg['vy'][i],
catg['vz'][i], catg['dens'][i], catg['tempg'][i], catg['h'][i], catg['zmetal'][i], catg['phi'][i]))
for i in range(header['ndark']):
f.write(struct.pack(">fffffffff", catd['mass'][i], catd['x'][i], catd['y'][i], catd['z'][i], catd['vx'][i], catd['vy'][i],
catd['vz'][i], catd['eps'][i], catd['phi'][i]))
for i in range(header['nstar']):
f.write(struct.pack(">fffffffffff", cats['mass'][i], cats['x'][i], cats['y'][i], cats['z'][i], cats['vx'][i], cats['vy'][i],
cats['vz'][i], cats['metals'][i], cats['tform'][i], cats['eps'][i], cats['phi'][i]))
f.close()
class gaslog(dict):
def __init__(self, fname):
self.rawdata = np.genfromtxt(fname, comments='#', dtype=None, names=['dTime', 'z', 'E', 'T', 'U', 'Eth', 'Lx', 'Ly', 'Lz',
'WallTime', 'dwMax', 'dIMax', 'dEMax', 'dMultiEff'])
for name in self.rawdata.dtype.names:
self[name] = self.rawdata[name]
self.units = {'erg': float(re.findall('dErgPerGmUnit:\s*[0-9,.,e,+,-]*', open(fname).read())[0].split()[1]) * \
float(re.findall('dMsolUnit:\s*[0-9,.,e,+,-]*', open(fname).read())[0].split()[1]) * 1.9891e33, 'yr': \
float(re.findall('dSecUnit:\s*[0-9,.,e,+,-]*', open(fname).read())[0].split()[1]) / 3.1557e7}
self['dTime'] *= self.units['yr']
self['E'] *= self.units['erg']
self['T'] *= self.units['erg']
self['U'] *= self.units['erg']
self['Eth'] *= self.units['erg']