def describe(table):
from booq.utils import stats
sts_list = []
for col in table.colnames():
sts = stats.basic( table[col] )
sts_list.append( sts )
return sts_list
def gc_serial(A_coord, B_coord, radius):
'''
'''
from astropy.coordinates import search_around_sky
def assert_input(A_coord, B_coord, radius):
from astropy.coordinates import SkyCoord
from astropy.units import Quantity
assert isinstance(A_coord,SkyCoord), "Was expecting an ~astropy.coordinates.SkyCoord instance for 'A_coord'."
assert isinstance(B_coord,SkyCoord), "Was expecting an ~astropy.coordinates.SkyCoord instance for 'B_coord'."
assert isinstance(radius,Quantity), "Was expecting an ~astropy.units.Quantity instance for 'radius'"
assert_input(A_coord, B_coord, radius)
logging.info("Searching B_coord {1} objects, {0} neighbors.".format(len(B_coord),len(A_coord)))
_prau = A_coord.ra.unit
_pdecu = A_coord.dec.unit
_nrau = B_coord.ra.unit
_ndecu = B_coord.dec.unit
logging.debug("Unit of coordinates being matched: ({0},{1}) and ({2},{3})".format(_prau,_pdecu,_nrau,_ndecu))
match_A_gc_idx, match_B_gc_idx, match_gc_sep, _d3d = search_around_sky(A_coord, B_coord, radius)
from booq.utils import stats
_sts = stats.basic(match_gc_sep.value)
logging.info("Basic stats of distances between matchings: {}".format(_sts))
assert len(match_A_gc_idx) == len(match_B_gc_idx)
return (match_A_gc_idx, match_B_gc_idx, match_gc_sep)
def nn_serial(A_coord, B_coord):
"""
Nearest-Neighbor search
Input:
- A_coord : ~astropy.coordinates.SkyCoord
reference catalog (catalog "A")
- B_coord : ~astropy.coordinates.SkyCoord
matching catalog (catalog "B")
Output:
- tuple with ~numpy.ndarray , ~astropy.units.Quantity
array of respective (to 'A_coord') index entries in 'B_coord'
, array of respective pair distances
"""
from astropy.coordinates import SkyCoord
assert isinstance(A_coord,SkyCoord), "Was expecting a ~astropy.coordinates.SkyCoord instance."
assert isinstance(B_coord,SkyCoord), "Was expecting a ~astropy.coordinates.SkyCoord instance."
logging.info("Searching among {0} neighbors, {1} reference objects.".format(len(B_coord),len(A_coord)))
_prau = A_coord.ra.unit
_pdecu = A_coord.dec.unit
_nrau = B_coord.ra.unit
_ndecu = B_coord.dec.unit
logging.debug("Unit of coordinates being matched: ({0},{1}) and ({2},{3})".format(_prau,_pdecu,_nrau,_ndecu))
from astropy.coordinates import match_coordinates_sky
match_A_nn_idx, match_A_nn_sep, _d3d = match_coordinates_sky(A_coord,B_coord)
from booq.utils import stats
_sts = stats.basic(match_A_nn_sep.value)
logging.info("Basic stats of distances between matchings: {}".format(_sts))
assert len(match_A_nn_idx) == len(A_coord)
assert match_A_nn_idx.max() < len(B_coord)
return (match_A_nn_idx, match_A_nn_sep)
