def take_snapshots(self,
snapshots,
ptype,
origin=None,
boxsize=None,
np=None):
""" ptype can be a list of ptypes, in which case all particles of the types are loaded into the field """
if numpy.isscalar(ptype):
ptypes = [ptype]
else:
ptypes = ptype
ptype = None
nptypes = len(snapshots[0].C['N'])
N = numpy.zeros((len(snapshots), nptypes), dtype='i8')
O = N.copy()
with sharedmem.TPool(np=np) as pool:
def work(i):
snapshot = snapshots[i]
for ptype in ptypes:
mask, count = filter(snapshot, ptype, origin, boxsize)
N[i, ptype] = count
snapshot.clear()
pool.map(work, range(len(snapshots)))
O.flat[1:] = N.cumsum()[:-1]
O = O.reshape(*N.shape)
self.numpoints = N.sum()
for comp in self.names:
shape = list(self[comp].shape)
shape[0] = self.numpoints
self[comp] = numpy.zeros(shape, self[comp].dtype)
with sharedmem.TPool(np=np) as pool:
def work(i):
snapshot = snapshots[i]
for ptype in ptypes:
mask, count = filter(snapshot, ptype, origin, boxsize)
for block in snapshot.schema:
if N[i, ptype] == 0: continue
if (ptype, block) not in snapshot: continue
if block not in self.names: continue
data = select(snapshot, ptype, block, mask)
self[block][O[i,
ptype]:O[i, ptype] + N[i, ptype]] = data
snapshot.clear()
pool.map(work, range(len(snapshots)))
def paint2(self,
ftype,
color,
luminosity,
camera=None,
kernel=None,
dtype='f8'):
""" paint field to CCD, (this paints the tree nodes)
returns
C, L where
C is the color of the pixel
L is the exposure of the pixel
Notice that if color is None,
C will be undefined,
L will still be the exposure.
the return values can be normalized by
nl_ or n_, then feed to imshow
"""
raise "Fix this."
CCD = numpy.zeros(self.shape, dtype=(dtype, 2))
tree = self.T[ftype]
if kernel is None: kernel = 'spline'
color, luminosity = self._getcomponent(ftype, color, luminosity)
if color is None:
color = 1.0
if luminosity is None:
luminosity = 1.0
colorp = TreeProperty(tree, color)
luminosityp = TreeProperty(tree, luminosity)
for cam in self._mkcameras(camera):
with sharedmem.TPool(np=self.np) as pool:
cams = cam.divide(int(pool.np**0.5 * 2), int(pool.np**0.5 * 2))
def work(cam, offx, offy):
mask = cam.prunetree(tree)
x, y, z = tree['pos'][mask].T
sml = tree['size'][mask][:, 0].copy() * 2
luminosity = luminosityp[mask]
color = colorp[mask]
smallCCD = numpy.zeros(cam.shape, dtype=(dtype, 2))
cam.paint(x,
y,
z,
sml,
color,
luminosity,
kernel=kernel,
out=smallCCD)
CCD[offx:offx + cam.shape[0],
offy:offy + cam.shape[1], :] += smallCCD
pool.starmap(work, cams.reshape(-1, 3))
C, L = CCD[..., 0], CCD[..., 1]
C[...] /= L
return C, L
def profile(field, component, center, rmin, rmax, weights=None, logscale=True, nbins=100, density=True, integrated=True):
""" returns centers, profile, and with of the bins,
if density == True, divide by volume
if integrated == True, use the sum of full enclose volume. otherwise use the shell"""
locations = field['locations']
component, weights = getcomponent(None, field, component, weights)
if logscale:
rmin = numpy.log10(rmin)
rmax = numpy.log10(rmax)
bins = numpy.linspace(rmin, rmax, nbins + 1, endpoint=True)
if integrated:
centers = bins[1:]
else:
centers = (bins[:-1] + bins[1:]) * 0.5
if logscale:
centers = 10 ** centers
bins = 10 ** bins
profil = numpy.zeros(nbins + 2, dtype='f8')
weight = numpy.zeros(nbins + 2, dtype='f8') # for the profile
with sharedmem.TPool() as pool:
chunksize = 1024 * 1024
def work(i):
sl = slice(i, i + chunksize)
r = ((locations[sl] - center) ** 2).sum(axis=-1) ** 0.5
dig = numpy.digitize(r, bins)
if weights is not None:
p = numpy.bincount(dig, weights=component[sl] * weights[sl], minlength=nbins+2)
w = numpy.bincount(dig, weights=weights[sl], minlength=nbins+2)
return p, w
else:
p = numpy.bincount(dig, weights=component[sl], minlength=nbins+2)
return p, None
def reduce(p, w):
if weights is not None:
profil[:] += p
weight[:] += w
else:
profil[:] += p
pool.map(work, range(0, len(locations), chunksize), reduce=reduce)
if integrated:
profil = profil.cumsum()
weight = weight.cumsum()
if weights is not None:
profil /= weight
if density:
if integrated:
profil[1:-1] /= 4 / 3.0 * 3.1416 * bins[1:] ** 3
else:
profil[1:-1] /= numpy.diff(4 / 3.0 * 3.1416 * bins ** 3)
return centers, profil[1:-1], numpy.diff(bins)[:-1]
def read(self, ftypes, fids=None, np=None):
""" read the field from given list of fids,
using at most np threads to read. (default is self.np)
0 is serial.
if fids is None, the cut defined in 'use' will be used.
returns the field of this ftype.
build the tree if the schema says so.
"""
if self.need_cut:
if fids is None and self.map is not None:
fids = self.map.cut(self.origin, self.boxsize)
if np is None:
np = self.np
if fids is not None:
snapnames = [self.snapname % i for i in fids]
elif '%d' in self.snapname:
snapnames = [self.snapname % i for i in range(self.C['Nfiles'])]
else:
snapnames = [self.snapname]
def getsnap(snapname):
try:
return Snapshot(snapname, self.format, template=self._template)
except IOError as e:
warnings.warn('file %s skipped for %s' % (snapname, str(e)))
return None
with sharedmem.TPool(np=np) as pool:
snapshots = filter(lambda x: x is not None,
pool.map(getsnap, snapnames))
rt = []
for ftype in _ensurelist(ftypes):
if self.need_cut:
self.F[ftype].take_snapshots(snapshots,
ptype=self.P[ftype],
boxsize=self.boxsize,
origin=self.origin,
np=np)
else:
self.F[ftype].take_snapshots(snapshots,
ptype=self.P[ftype],
np=np)
self.buildtree(ftype)
rt += [self[ftype]]
if numpy.isscalar(ftypes):
return rt[0]
else:
return rt
def dump_snapshots(self,
snapshots,
ptype,
save_and_clear=False,
C=None,
np=None):
""" dump field into snapshots.
if save_and_clear is True, immediately save the file and clear the snapshot object,
using less memory.
otherwise, leave the data in memory in snapshot object. and only the header is written.
C is the template used for the snapshot headers.
"""
Nfile = len(snapshots)
starts = numpy.zeros(dtype='u8', shape=Nfile)
for i in range(Nfile):
snapshot = snapshots[i]
if C is not None:
snapshot.C[...] = C
starts[i] = self.numpoints * i / Nfile
snapshot.C['N'][ptype] = self.numpoints * (
i + 1) / Nfile - self.numpoints * i / Nfile
tmp = snapshot.C['Ntot']
tmp[ptype] = self.numpoints
snapshot.C['Ntot'] = tmp
snapshot.C['Nfiles'] = Nfile
skipped_comps = set([])
def work(i):
snapshot = snapshots[i]
if save_and_clear:
snapshot.create_structure()
for comp in self.names:
try:
dtype = snapshot.reader[comp].dtype
except KeyError:
skipped_comps.update(set([comp]))
continue
snapshot[ptype, comp] = numpy.array(
self[comp][starts[i]:starts[i] + snapshot.C['N'][ptype]],
dtype=dtype.base,
copy=False)
if save_and_clear:
snapshot.save(comp, ptype)
snapshot.clear(comp, ptype)
#skip if the reader doesn't save the block
with sharedmem.TPool(np=np) as pool:
pool.map(work, list(range(Nfile)))
if skipped_comps:
warnings.warn('warning: blocks not supported in snapshot: %s',
str(skipped_comps))
def select(self, ftype, sml=0, camera=None):
""" return a mask whether particles are in the camera """
locations, = self._getcomponent(ftype, 'locations')
x, y, z = locations.T
mask = numpy.zeros(len(x), dtype='?')
for cam in self._mkcameras(camera):
with sharedmem.TPool(np=self.np) as pool:
chunksize = 1024 * 1024
def work(i):
sl = slice(i, i + chunksize)
mask[sl] |= (cam.mask(x[sl], y[sl], z[sl], sml[sl]) != 0)
pool.map(work, range(0, len(mask), chunksize))
return mask
def unfold(self, M, ftype=None, center=None):
""" unfold the field position by transformation M
the field shall be periodic. M is an
list of column integer vectors of the shearing
vectors. abs(det(M)) = 1
the field has to be in a cubic box located from (0,0,0)
"""
assert self.periodic
from gaepsi.compiledbase.geometry import Rotation, Cubenoid
if center is None:
cub = Cubenoid(M, self.origin, self.boxsize, center=0, neworigin=0)
else:
cub = Cubenoid(M, self.origin, self.boxsize, center=center)
self.boxsize[...] = cub.newboxsize
self.origin[...] = cub.neworigin
self.periodic = False
if ftype is None: ftypes = self.F.keys()
else: ftypes = _ensurelist(ftype)
for ftype in ftypes:
locations, = self._getcomponent(ftype, 'locations')
x, y, z = locations.T
with sharedmem.TPool(np=self.np) as pool:
chunksize = 1024 * 1024
def work(i):
sl = slice(i, i + chunksize)
rt = cub.apply(x[sl], y[sl], z[sl])
return (rt < 0).sum()
badness = numpy.sum(pool.map(work, range(0, len(x),
chunksize)))
if badness > 0:
warnings.warn("some %d points are outside the box" % badness)
for ftype in ftypes:
if ftype in self.T and self.T[ftype] != False:
self.buildtree(ftype)
def makeT(self, ftype, Xh=0.76, halo=False):
"""T will be in Kelvin"""
gas = self.F[ftype]
gas['T'] = numpy.empty(dtype='f4', shape=gas.numpoints)
with sharedmem.TPool(np=self.np) as pool:
chunksize = 1024 * 1024
def work(i):
sl = slice(i, i + chunksize)
if halo:
gas['T'][sl] = gas['vel'][sl, 0]**2
gas['T'][sl] += gas['vel'][sl, 1]**2
gas['T'][sl] += gas['vel'][sl, 2]**2
gas['T'][sl] *= 0.5
gas['T'][sl] *= self.U.TEMPERATURE
else:
self.cosmology.ie2T(ie=gas['ie'][sl],
ye=gas['ye'][sl],
Xh=Xh,
out=gas['T'][sl])
gas['T'][sl] *= self.U.TEMPERATURE
pool.map(work, range(0, len(gas['T']), chunksize))
def qlf(cosmology, band, magnitude=False, returnraw=False):
""" returns an scipy interpolated function for the hopkins 2007 QLF,
at a given band.
band can be a frequency, or 'bol', 'blue', 'ir', 'soft', 'hard'.
HOPKINS2007 cosmology is implied.
result shall not depend on the input cosmology but the HOPKINS cosmology
is implied in the fits.
if return raw is true, return
zrange, Lbol, Lband, M_AB, S_nu, Phi
"""
zbins = numpy.linspace(0, 6, 200)
Lbolbins=numpy.linspace(8, 18, 300)
U = cosmology.units
banddict = {'bol':0, 'blue':-1, 'ir':-2, 'soft':-3, 'hard': -4}
from scipy.interpolate import RectBivariateSpline
if band in banddict:
band = banddict[band]
else: band = _bandconv(U, band, hertz=True)
key = band
if key not in _qlf_interp:
v = numpy.empty(numpy.broadcast(Lbolbins[None, :], zbins[:, None]).shape)
Lband, M_AB, S_nu, Phi = _qlf.qlf(band, 1.0, Lbolbins)
with sharedmem.TPool() as pool:
def work(v, z):
Lband_, M_AB_, S_nu, Phi = _qlf.qlf(band, z, Lbolbins)
v[:] = Phi
pool.starmap(work, zip(v, zbins))
v /= (U.MPC ** 3)
# Notice that hopkins used 3.9e33 ergs/s for Lsun, but we use a different number.
# but the internal fits of his numbers
# thus we skip the conversion, in order to match the fits with luminosity in terms of Lsun.
# Lbol = Lbol - numpy.log10(U.SOLARLUMINOSITY/U.ERG*U.SECOND) + numpy.log10(3.9e33)
data = numpy.empty(shape=len(Lbolbins),
dtype=[
('Lbol', 'f4'),
('Lband', 'f4'),
('M_AB', 'f4'),
('S_nu', 'f4'),
('Phi', ('f4', v.shape[0]))])
data['Lbol'] = Lbolbins
data['Lband'] = Lband
data['M_AB'] = M_AB
data['S_nu'] = S_nu
data['Phi'] = v.T
_qlf_interp[key] = data
data = _qlf_interp[key]
if returnraw:
return data.view(numpy.recarray)
if magnitude:
func = RectBivariateSpline(zbins, - data['M_AB'], data['Phi'].T)
func.x = zbins
func.y = -data['M_AB']
func.z = data['Phi'].T
return func
else:
func = RectBivariateSpline(zbins, data['Lband'], data['Phi'].T)
func.x = zbins
func.y = data['Lband']
func.z = data['Phi'].T
return func
