def arraystat_2 (table, sid, season=0, rob=True, per=True, flags=0) :
""" Calculates a complicated number of parameters for a given star.
Inputs:
table -- an ATpy table with time-series photometry
sid -- a WFCAM source ID.
Optional inputs:
season -- which season to select (1,2,3, or other=All)
rob -- also use Robust statistics? (takes longer, default True)
per -- run period-finding? (takes longer, default True)
flags -- Maximum ppErrBit quality flags to use (default 0)
Returns:
ret -- a data structure containing the computed values.
"""
s_table = data_cut( table, [sid], season=season, flags=flags )
if len(s_table) < 1:
print "no data for %d!" % sid
return None
jcol = s_table.JAPERMAG3; jerr = s_table.JAPERMAG3ERR
hcol = s_table.HAPERMAG3; herr = s_table.HAPERMAG3ERR
kcol = s_table.KAPERMAG3; kerr = s_table.KAPERMAG3ERR
jmhcol=s_table.JMHPNT ; jmherr = s_table.JMHPNTERR
hmkcol=s_table.HMKPNT ; hmkerr = s_table.HMKPNTERR
racol= s_table.RA
decol= s_table.DEC
date = s_table.MEANMJDOBS
messy_table = data_cut( table, [sid], season=-1 )
jppcol=messy_table.JPPERRBITS
hppcol=messy_table.HPPERRBITS
kppcol=messy_table.KPPERRBITS
# make an empty data structure and just assign it information, then return
# the object itself!!! then there's no more worrying about indices.
class Empty():
pass
ret = Empty()
ret.N = len(s_table)
ret.RA = racol.mean()
ret.DEC = decol.mean()
ret.chip = get_chip(date[0], np.degrees(racol[0]), np.degrees(decol[0]))
if ret.N > 4:
ret.one_chip = ( get_chip(date[0], racol[0], decol[0]) ==
get_chip(date[1], racol[1], decol[1]) ==
get_chip(date[2], racol[2], decol[2]) ==
get_chip(date[3], racol[3], decol[3]) )
else:
ret.one_chip = True
ret.Stetson = stetson.S(jcol, jerr, hcol, herr, kcol, kerr)
ret.j = Empty(); ret.j.data = jcol; ret.j.err = jerr
ret.h = Empty(); ret.h.data = hcol; ret.h.err = herr
ret.k = Empty(); ret.k.data = kcol; ret.k.err = kerr
ret.jmh = Empty(); ret.jmh.data=jmhcol; ret.jmh.err = jmherr
ret.hmk = Empty(); ret.hmk.data=hmkcol; ret.hmk.err = hmkerr
bands = [ ret.j, ret.h, ret.k, ret.jmh, ret.hmk ]
for b in bands:
# use b.data, b.err
b.rchi2 = reduced_chisq( b.data, b.err )
b.mean = b.data.mean()
b.rms = b.data.std()
b.min = b.data.min()
b.max = b.data.max()
b.peak_trough = b.max - b.min
b.mean_err = b.err.mean()
# Robust quantifiers simply have an "r" at the end of their names
if rob:
b.datar = rb.removeoutliers(b.data, 3, niter=2)
b.meanr = rb.meanr(b.data)
b.rmsr = rb.stdr(b.data)
b.minr = b.datar.min()
b.maxr = b.datar.max()
b.peak_troughr = b.maxr - b.minr
# Period finding... is a little dodgy still, and might take forever
if per:
b.lsp = lsp(date, b.data, 6., 6.) # apologies if this is cluttered
Jmax = lsp_mask(b.lsp[0], b.lsp[1])
b.lsp_per = 1./ b.lsp[0][Jmax]
b.lsp_pow = b.lsp[1][Jmax]
b.fx2_per = 1./ test_analyze( date, b.data, b.err )
# Finally we'll want to do the whole slope, distance on the JMH graph
# (until I get the fitting done, we'll have to use hmk and jmh naively)
ret.color_slope = (ret.jmh.peak_trough / ret.hmk.peak_trough)
# and the pp_max, using the messy table
ret.jpp_max = jppcol.max()
ret.hpp_max = hppcol.max()
ret.kpp_max = kppcol.max()
return ret
def happy_chipnights ( data_table, corrections_table, max_correction=.0125 ):
''' Removes bad chip-nights from a data table.
Inputs:
data_table -- an ATpy table with WFCAM time-series photometry.
corrections_table -- an ATpy table with per-night per-chip corrections.
Optional inputs:
max_correction -- the minimum "chip deviation" to flag a chip_night as
needing removal.
'''
# So, we'll load up the table, and... for every datapoint we'll
# filter stuff? That might take forever!
# Alternatively, we could check every source for whether it's on only
# one chip
# How do I even delete a row from an atpy table?
# Ah... I have a clever way to do it I think.
# The best way to do this seems to be to add the j,h,k corrections columns to this table, then populate them row-by-row, and filter it all at the end! Okay, I'll do that.
ctable = corrections_table
# I think I just learned how to copy tables!
# it uses really silly "where" calls like where something is positive or negative or zero
if atpy.__version__ == '0.9.3':
try:
# deleting the columns we need to create in a sec
data_table.remove_columns( ['j_correction',
'h_correction',
'k_correction'])
except:
pass
table = data_table
else:
# making a friggin copy so we can use it, and calling it table
table = data_table.copy()
table.add_empty_column('j_correction', np.float64)
table.add_empty_column('h_correction', np.float64)
table.add_empty_column('k_correction', np.float64)
for row in data_table:
chip = n2.get_chip( row['MEANMJDOBS'],
np.degrees(row['RA']),
np.degrees(row['DEC']) )
local_corrections = ctable.where( (ctable.date == row['MEANMJDOBS']) &
(ctable.chip == chip) )
row['j_correction'] = local_corrections.j_correction
row['h_correction'] = local_corrections.h_correction
row['k_correction'] = local_corrections.k_correction
print "Made corrections rows! They look like this (j, h, k):"
print table.j_correction[0]
print table.h_correction[0]
print table.k_correction[0]
# Now I guess it's time to filter stuff... though the above seems
# pretty useful on its own... like, that's basically the implementation
# for apply_corrections...
f_table = table.where( (np.abs(table.j_correction) < max_correction) &
(np.abs(table.h_correction) < max_correction) &
(np.abs(table.k_correction) < max_correction) )
print "done filtering!"
return f_table
