def Rs(nside,
field,
component,
weight,
levels=[0.1, 0.5, 0.9],
center=None,
rmax=None,
rmin=None,
direction=1,
nbins=500,
return_all=False):
""" direction = +1 or -1, for increasing or decreasing """
if center is None:
center = field.cut.center
if rmax is None:
rmax = field.cut.size[0] / 2
if rmin is None:
rmin = rmax / 200
disp = field['locations'] - center[newaxis, :]
r = (disp[:, 0:3]**2).sum(axis=-1)**0.5
mask = (r < rmax) & (r > rmin)
if nside > 0:
npix = hy.nside2npix(nside)
pixid = hy.vec2pix_nest(nside, disp[mask, 0] / r[mask],
disp[mask, 1] / r[mask],
disp[mask, 2] / r[mask])
else:
npix = 1
pixid = 0
bins = linspace(rmin, rmax, nbins)
rid = digitize(r[mask], bins)
Mhist = zeros((npix, bins.shape[0]))
HIhist = zeros_like(Mhist)
flatid = pixid * bins.shape[0] + rid
Mcount = bincount(flatid, field[weight][mask])
HIcount = bincount(flatid, field[weight][mask] * field[component][mask])
a = arange(len(Mcount))
Mhist.reshape(-1)[a] = Mcount
a = arange(len(HIcount))
HIhist.reshape(-1)[a] = HIcount
ahist = HIhist / Mhist
result = []
for l in levels:
if direction > 0:
ridout = first(ahist > l)
ridin = last(ahist < l, first=ridout)
else:
ridout = first(ahist < l)
ridin = last(ahist > l, first=ridout)
rs = 0.5 * (bins[ridin] + bins[ridout + 1])
result += [rs]
if return_all:
return result, ahist, bins
else:
return result
def Rs(nside, field, component, weight, levels=[0.1, 0.5, 0.9], center=None, rmax=None, rmin=None, direction=1, nbins=500, return_all=False):
""" direction = +1 or -1, for increasing or decreasing """
if center is None:
center = field.cut.center
if rmax is None:
rmax = field.cut.size[0] / 2
if rmin is None:
rmin = rmax / 200
disp = field['locations'] - center[newaxis, :]
r = (disp[:,0:3] **2).sum(axis=-1) ** 0.5
mask = (r < rmax) & (r > rmin)
if nside > 0:
npix = hy.nside2npix(nside)
pixid = hy.vec2pix_nest(nside, disp[mask,0]/r[mask], disp[mask, 1]/r[mask], disp[mask,2]/r[mask])
else:
npix = 1
pixid = 0
bins = linspace(rmin, rmax, nbins)
rid = digitize(r[mask], bins)
Mhist = zeros((npix , bins.shape[0]))
HIhist = zeros_like(Mhist)
flatid = pixid * bins.shape[0] + rid
Mcount = bincount(flatid, field[weight][mask])
HIcount = bincount(flatid, field[weight][mask] * field[component][mask])
a = arange(len(Mcount))
Mhist.reshape(-1)[a] = Mcount
a = arange(len(HIcount))
HIhist.reshape(-1)[a] = HIcount
ahist = HIhist / Mhist
result = []
for l in levels:
if direction > 0:
ridout = first(ahist>l)
ridin = last(ahist<l, first=ridout)
else:
ridout = first(ahist<l)
ridin = last(ahist>l, first=ridout)
rs = 0.5 * (bins[ridin] + bins[ridout + 1])
result += [rs]
if return_all:
return result, ahist, bins
else:
return result
def chop(Nside, pos):
""" bootstrap the sky, returns about 100 chunks, only 50 of them are big"""
# we paint quasar uniformly as long as it is covered by sdss:
Npix = chealpy.nside2npix(Nside)
chunkid = sharedmem.empty(len(pos), dtype='intp')
print len(pos)
with sharedmem.MapReduce() as pool:
chunksize = 1024 * 1024
def work(i):
sl = slice(i, i + chunksize)
chunkid[sl] = chealpy.vec2pix_nest(Nside, pos[sl])
pool.map(work, range(0, len(pos), chunksize))
arg = sharedmem.argsort(chunkid)
chunksize = sharedmem.array.bincount(chunkid, minlength=Npix)
assert (chunksize == numpy.bincount(chunkid, minlength=Npix)).all()
return sharedmem.array.packarray(arg, chunksize)
def sum(nside, field, component, center=None, rmax=None, rmin=None):
if center is None:
center = field.cut.center
if rmax is None:
rmax = field.cut.size[0] / 2
if rmin is None:
rmin = rmax / 200
disp = field['locations'] - center[newaxis, :]
r = (disp[:,0:3] **2).sum(axis=-1) ** 0.5
mask = (r < rmax) & (r > rmin)
npix = hy.nside2npix(nside)
pixid = hy.vec2pix_nest(nside, disp[mask,0]/r[mask], disp[mask, 1]/r[mask], disp[mask,2]/r[mask])
Mhist = zeros(npix)
Mcount = bincount(pixid, field[component][mask])
a = arange(len(Mcount))
Mhist.reshape(-1)[a] = Mcount
return Mhist
def sum(nside, field, component, center=None, rmax=None, rmin=None):
if center is None:
center = field.cut.center
if rmax is None:
rmax = field.cut.size[0] / 2
if rmin is None:
rmin = rmax / 200
disp = field['locations'] - center[newaxis, :]
r = (disp[:, 0:3]**2).sum(axis=-1)**0.5
mask = (r < rmax) & (r > rmin)
npix = hy.nside2npix(nside)
pixid = hy.vec2pix_nest(nside, disp[mask, 0] / r[mask],
disp[mask, 1] / r[mask], disp[mask, 2] / r[mask])
Mhist = zeros(npix)
Mcount = bincount(pixid, field[component][mask])
a = arange(len(Mcount))
Mhist.reshape(-1)[a] = Mcount
return Mhist