def collimfunc(delthetra,delthetdec,lxpc=1,ra0=83.63,dec0=22.01) :
"""
Read LAXPC collimator response from files and give response (max unity) for
given offset angles theta and phi
"""
fnamera = "LX" + str(lxpc) + "0_RA.txt"
fnamedec = "LX" + str(lxpc) + "0_Dec.txt"
tlpcr,raval = np.genfromtxt(fnamera,skip_header=1,unpack=True)
ipr = ip(tlpcr,raval,k=2)
drr = lambda z : ipr.derivatives(z)[1]
tlrmax = fsolve(drr,16879)[0]
tlpcd,decval = np.genfromtxt(fnamedec,skip_header=1,unpack=True)
ipd = ip(tlpcd,decval,k=2)
ddr = lambda z : ipd.derivatives(z)[1]
tldmax = fsolve(ddr,29226)[0]
tra,ra = np.genfromtxt('rascan.txt',skip_header=1,unpack=True)
tdec,dec = np.genfromtxt('./decscan.txt',skip_header=1,unpack=True)
poltra = np.polyfit(ra-ra0,tra,1)
poltdec = np.polyfit(dec-dec0,tdec,1)#Inverting the variables for linfit
fra = np.poly1d(poltra)
fdec = np.poly1d(poltdec)
timra = fra(np.rad2deg(delthetra))
timdec = fdec(np.rad2deg(delthetdec))
if (timra > tra.max() | timra < tra.min() | timdec > tdec.max() | timdec < \
tdec.min()) :
raise ValueError("Angle out of FOV")
return ipr(timra)/ipr(tlrmax)*ipd(timdec)/ipd(tldmax)
def collimfunc(delthetra,
delthetdec,
lxpc=1,
ra0=83.63,
dec0=22.01,
full=False):
"""
Read LAXPC collimator response from files and give response (max unity) for
given offset angles theta and phi
"""
#print "delthetra = "
#print delthetra
#print "delthetdec = "
#print delthetdec
fnamera = folfits + "LX" + str(lxpc) + "0_RA.txt"
fnamedec = folfits + "LX" + str(lxpc) + "0_Dec.txt"
tlpcr, raval = np.genfromtxt(fnamera, skip_header=1, unpack=True)
ipr = ip(tlpcr, raval, k=2)
drr = lambda z: ipr.derivatives(z)[1]
tlrmax = fsolve(drr,
16879)[0] # Note that I am using my maximas instead of
#the ones given in Table 2 of Antia's paper. Cursory examination shows
#difference to be minimal - must shift to Table 2 vals soon
tlpcd, decval = np.genfromtxt(fnamedec, skip_header=1, unpack=True)
ipd = ip(tlpcd, decval, k=2)
ddr = lambda z: ipd.derivatives(z)[1]
tldmax = fsolve(ddr, 29226)[0]
tra, ra = np.genfromtxt(folfits + 'rascan.txt', skip_header=1, unpack=True)
tdec, dec = np.genfromtxt(folfits + 'decscan.txt',
skip_header=1,
unpack=True)
poltra = np.polyfit(ra - ra0, tra, 1)
poltdec = np.polyfit(dec - dec0, tdec,
1) #Inverting the variables for linfit
fra = np.poly1d(poltra)
fdec = np.poly1d(poltdec)
rapc = (tlpcr - poltra[1]) / poltra[0]
decpc = (tlpcd - poltdec[1]) / poltdec[0]
if ( np.any(np.rad2deg(delthetra) > rapc.max()) | \
np.any(np.rad2deg(delthetra) < rapc.min()) | \
np.any(np.rad2deg(delthetdec) > decpc.max()) | \
np.any(np.rad2deg(delthetdec) < decpc.min()) ) :
raise MyValueError("Angle out of FOV")
timra = fra(np.rad2deg(delthetra))
timdec = fdec(np.rad2deg(delthetdec))
if (full):
dramax = (tlrmax -
poltra[1]) / poltra[0] # using inverse polynom funcn
ddecmax = (tldmax - poltdec[1]) / poltdec[0]
return ipr(timra) / ipr(tlrmax) * ipd(timdec) / ipd(
tldmax), dramax, ddecmax
return ipr(timra) / ipr(tlrmax) * ipd(timdec) / ipd(tldmax)
def effarea(lxpc) : """ Gets integrated eff. area between 3 to 80 keV """ fname="effarea_lxpc.txt" ener,area = np.genfromtxt(fname,unpack=True) idnan = np.where(np.isnan(ener))[0] if (lxpc == 1) : idpc = np.arange(0,idnan[0]) if (lxpc == 2) : idpc = np.arange(idnan[0]+1,idnan[1]) if (lxpc == 3) : idpc = np.arange(idnan[1]+1,idnan[2]) fn = ip(ener[idpc],area[idpc],k=1) #intar = quad(fn,3.0,31.90)[0] + quad(fn,32.5,80.0)[0] # breaking integral at 32 keV discontinuity intar = quad(fn,3.0,80.0) # no use breaking the func - see what prblm return intar[0]
def effarea(lxpc,elo=3.0,ehi=15.0) :
"""
Gets integrated eff. area between 3 to 80 keV
"""
fname=folfits + "effarea_lxpc.txt"
ener,area = np.genfromtxt(fname,unpack=True)
idnan = np.where(np.isnan(ener))[0]
if (lxpc == 1) :
idpc = np.arange(0,idnan[0])
if (lxpc == 2) :
idpc = np.arange(idnan[0]+1,idnan[1])
if (lxpc == 3) :
idpc = np.arange(idnan[1]+1,idnan[2])
fn = ip(ener[idpc],area[idpc],k=1)
#intar = quad(fn,3.0,31.90)[0] + quad(fn,32.5,80.0)[0] # breaking integral at 32 keV discontinuity
intar = quad(fn,elo,ehi) # no use breaking the func - see what prblm
#intar = romb(area[idpc],ener[idpc],elo,ehi) # why not use discrete integration ?
geomar = 3600 # cm^2 100cm x 36 cm (and 15 cm depth - see http://www.tifr.res.in/~astrosat_laxpc/specification.html)
return intar[0]/(geomar*(ehi - elo))
def interpolate_power(spec,
mode="linear",
domain=None,
kindex=None,
newkindex=None,
loglog=False,
**kwargs):
"""
Interpolates a given power spectrum at new k(-indices).
Parameters
----------
spec : {scalar, list, array, field, function}
The power spectrum. A scalars is interpreted as a constant
spectrum.
mode : string
String specifying the interpolation scheme, supported
schemes are (default: "linear"):
- "linear"
- "nearest"
- "zero"
- "slinear"
- "quadratic"
- "cubic"
domain : space, *optional*
The space wherein the power spectrum is defined (default: None).
kindex : numpy.ndarray, *optional*
Scales corresponding to each band in the old power spectrum;
can be retrieved from `domain` (default: None).
newkindex : numpy.ndarray, *optional*
Scales corresponding to each band in the new power spectrum;
can be retrieved from `domain` if `kindex` is given
(default: None).
loglog : bool, *optional*
Flag specifying whether the interpolation is done on log-log-scale
(ignoring the monopole) or not (default: False)
Returns
-------
newspec : numpy.ndarray
The interpolated power spectrum.
Other Parameters
----------------
log : bool, *optional*
Flag specifying if the spectral binning is performed on logarithmic
scale or not; if set, the number of used bins is set
automatically (if not given otherwise); by default no binning
is done (default: None).
nbin : integer, *optional*
Number of used spectral bins; if given `log` is set to ``False``;
integers below the minimum of 3 induce an automatic setting;
by default no binning is done (default: None).
binbounds : {list, array}, *optional*
User specific inner boundaries of the bins, which are preferred
over the above parameters; by default no binning is done
(default: None). vmin : {scalar, list, ndarray, field}, *optional*
Lower limit of the uniform distribution if ``random == "uni"``
(default: 0).
See Also
--------
scipy.interpolate.interp1d
Raises
------
Exception, IndexError, TypeError, ValueError
If some input is invalid.
ValueError
If an interpolation is flawed.
"""
## check implicit kindex
if (kindex is None):
if (isinstance(domain, space)):
try:
domain.set_power_indices(**kwargs)
except:
raise ValueError(
about._errors.cstring("ERROR: invalid input."))
else:
kindex = domain.power_indices.get("kindex")
else:
raise TypeError(
about._errors.cstring("ERROR: insufficient input."))
## check power spectrum
spec = domain.enforce_power(spec, size=np.size(kindex))
## check explicit newkindex
if (newkindex is None):
raise Exception(
about._errors.cstring("ERROR: insufficient input."))
else:
newkindex = np.sort(np.real(
np.array(newkindex,
dtype=domain.vol.dtype).flatten(order='C')),
axis=0,
kind="quicksort",
order=None)
## check explicit kindex
else:
kindex = np.sort(np.real(
np.array(kindex, dtype=None).flatten(order='C')),
axis=0,
kind="quicksort",
order=None)
## check power spectrum
if (isinstance(spec, field)):
spec = spec.val.astype(kindex.dtype)
elif (callable(spec)):
try:
spec = np.array(spec(kindex), dtype=None)
except:
TypeError(
about._errors.cstring(
"ERROR: invalid power spectra function.")
) ## exception in ``spec(kindex)``
elif (np.isscalar(spec)):
spec = np.array([spec], dtype=None)
else:
spec = np.array(spec, dtype=None)
## drop imaginary part
spec = np.real(spec)
## check finiteness and positivity (excluding null)
if (not np.all(np.isfinite(spec))):
raise ValueError(
about._errors.cstring("ERROR: infinite value(s)."))
elif (np.any(spec < 0)):
raise ValueError(
about._errors.cstring("ERROR: nonpositive value(s)."))
elif (np.any(spec == 0)):
about.warnings.cprint("WARNING: nonpositive value(s).")
size = np.size(kindex)
## extend
if (np.size(spec) == 1):
spec = spec * np.ones(size, dtype=spec.dtype, order='C')
## size check
elif (np.size(spec) < size):
raise ValueError(
about._errors.cstring("ERROR: size mismatch ( " +
str(np.size(spec)) + " < " + str(size) +
" )."))
elif (np.size(spec) > size):
about.warnings.cprint("WARNING: power spectrum cut to size ( == " +
str(size) + " ).")
spec = spec[:size]
## check implicit newkindex
if (newkindex is None):
if (isinstance(domain, space)):
try:
domain.set_power_indices(**kwargs)
except:
raise ValueError(
about._errors.cstring("ERROR: invalid input."))
else:
newkindex = domain.power_indices.get("kindex")
else:
raise TypeError(
about._errors.cstring("ERROR: insufficient input."))
## check explicit newkindex
else:
newkindex = np.sort(np.real(
np.array(newkindex, dtype=None).flatten(order='C')),
axis=0,
kind="quicksort",
order=None)
## check bounds
if (kindex[0] < 0) or (newkindex[0] < 0):
raise ValueError(about._errors.cstring("ERROR: invalid input."))
if (np.any(newkindex > kindex[-1])):
about.warnings.cprint("WARNING: interpolation beyond upper bound.")
## continuation extension by point mirror
nmirror = np.size(kindex) - np.searchsorted(
kindex, 2 * kindex[-1] - newkindex[-1], side='left') + 1
spec = np.r_[spec,
np.exp(2 * np.log(spec[-1]) -
np.log(spec[-nmirror:-1][::-1]))]
kindex = np.r_[kindex, (2 * kindex[-1] - kindex[-nmirror:-1][::-1])]
## interpolation
if (loglog):
## map to log-log-scale ignoring monopole
logspec = np.log(spec[1:])
logspec = ip(np.log(kindex[1:]),
logspec,
kind=mode,
axis=0,
copy=True,
bounds_error=True,
fill_value=np.NAN)(np.log(newkindex[1:]))
newspec = np.concatenate([[spec[0]], np.exp(logspec)])
else:
newspec = ip(kindex,
spec,
kind=mode,
axis=0,
copy=True,
bounds_error=True,
fill_value=np.NAN)(newkindex)
## check new power spectrum
if (not np.all(np.isfinite(newspec))):
raise ValueError(about._errors.cstring("ERROR: infinite value(s)."))
elif (np.any(newspec < 0)):
raise ValueError(about._errors.cstring("ERROR: nonpositive value(s)."))
elif (np.any(newspec == 0)):
about.warnings.cprint("WARNING: nonpositive value(s).")
return newspec
def interpolate_power(spec,mode="linear",domain=None,kindex=None,newkindex=None,**kwargs):
"""
Interpolates a given power spectrum at new k(-indices).
Parameters
----------
spec : {scalar, list, array, field, function}
The power spectrum. A scalars is interpreted as a constant
spectrum.
mode : string
String specifying the interpolation scheme, supported
schemes are (default: "linear"):
- "linear"
- "nearest"
- "zero"
- "slinear"
- "quadratic"
- "cubic"
domain : space, *optional*
The space wherein the power spectrum is defined (default: None).
kindex : numpy.ndarray, *optional*
Scales corresponding to each band in the old power spectrum;
can be retrieved from `domain` (default: None).
newkindex : numpy.ndarray, *optional*
Scales corresponding to each band in the new power spectrum;
can be retrieved from `domain` if `kindex` is given
(default: None).
Returns
-------
newspec : numpy.ndarray
The interpolated power spectrum.
Other Parameters
----------------
log : bool, *optional*
Flag specifying if the spectral binning is performed on logarithmic
scale or not; if set, the number of used bins is set
automatically (if not given otherwise); by default no binning
is done (default: None).
nbin : integer, *optional*
Number of used spectral bins; if given `log` is set to ``False``;
integers below the minimum of 3 induce an automatic setting;
by default no binning is done (default: None).
binbounds : {list, array}, *optional*
User specific inner boundaries of the bins, which are preferred
over the above parameters; by default no binning is done
(default: None). vmin : {scalar, list, ndarray, field}, *optional*
Lower limit of the uniform distribution if ``random == "uni"``
(default: 0).
See Also
--------
scipy.interpolate.interp1d
Raises
------
Exception, IndexError, TypeError, ValueError
If some input is invalid.
ValueError
If an interpolation is flawed.
"""
## check implicit kindex
if(kindex is None):
if(isinstance(domain,space)):
try:
domain.set_power_indices(**kwargs)
except:
raise ValueError(about._errors.cstring("ERROR: invalid input."))
else:
kindex = domain.power_indices.get("kindex")
else:
raise TypeError(about._errors.cstring("ERROR: insufficient input."))
## check power spectrum
spec = domain.enforce_power(spec,size=np.size(kindex))
## check explicit newkindex
if(newkindex is None):
raise Exception(about._errors.cstring("ERROR: insufficient input."))
else:
newkindex = np.sort(np.real(np.array(newkindex,dtype=domain.vol.dtype).flatten(order='C')),axis=0,kind="quicksort",order=None)
## check explicit kindex
else:
kindex = np.sort(np.real(np.array(kindex,dtype=None).flatten(order='C')),axis=0,kind="quicksort",order=None)
## check power spectrum
if(isinstance(spec,field)):
spec = spec.val.astype(kindex.dtype)
elif(callable(spec)):
try:
spec = np.array(spec(kindex),dtype=kindex.dtype)
except:
TypeError(about._errors.cstring("ERROR: invalid power spectra function.")) ## exception in ``spec(kindex)``
elif(np.isscalar(spec)):
spec = np.array([spec],dtype=kindex.dtype)
else:
spec = np.array(spec,dtype=kindex.dtype)
## drop imaginary part
spec = np.real(spec)
## check finiteness and positivity (excluding null)
if(not np.all(np.isfinite(spec))):
raise ValueError(about._errors.cstring("ERROR: infinite value(s)."))
elif(np.any(spec<0)):
raise ValueError(about._errors.cstring("ERROR: nonpositive value(s)."))
elif(np.any(spec==0)):
about.warnings.cprint("WARNING: nonpositive value(s).")
size = np.size(kindex)
## extend
if(np.size(spec)==1):
spec = spec*np.ones(size,dtype=spec.dtype,order='C')
## size check
elif(np.size(spec)<size):
raise ValueError(about._errors.cstring("ERROR: size mismatch ( "+str(np.size(spec))+" < "+str(size)+" )."))
elif(np.size(spec)>size):
about.warnings.cprint("WARNING: power spectrum cut to size ( == "+str(size)+" ).")
spec = spec[:size]
## check implicit newkindex
if(newkindex is None):
if(isinstance(domain,space)):
try:
domain.set_power_indices(**kwargs)
except:
raise ValueError(about._errors.cstring("ERROR: invalid input."))
else:
newkindex = domain.power_indices.get("kindex")
else:
raise TypeError(about._errors.cstring("ERROR: insufficient input."))
## check explicit newkindex
else:
newkindex = np.sort(np.real(np.array(newkindex,dtype=None).flatten(order='C')),axis=0,kind="quicksort",order=None)
## check bounds
if(kindex[0]<0)or(newkindex[0]<0):
raise ValueError(about._errors.cstring("ERROR: invalid input."))
if(np.any(newkindex>kindex[-1])):
about.warnings.cprint("WARNING: interpolation beyond upper bound.")
## continuation extension by point mirror
nmirror = np.size(kindex)-np.searchsorted(kindex,2*kindex[-1]-newkindex[-1],side='left')+1
spec = np.r_[spec,np.exp(2*np.log(spec[-1])-np.log(spec[-nmirror:-1][::-1]))]
kindex = np.r_[kindex,(2*kindex[-1]-kindex[-nmirror:-1][::-1])]
## interpolation
newspec = ip(kindex,spec,kind=mode,axis=0,copy=True,bounds_error=True,fill_value=np.NAN)(newkindex)
## check new power spectrum
if(not np.all(np.isfinite(newspec))):
raise ValueError(about._errors.cstring("ERROR: infinite value(s)."))
elif(np.any(newspec<0)):
raise ValueError(about._errors.cstring("ERROR: nonpositive value(s)."))
elif(np.any(newspec==0)):
about.warnings.cprint("WARNING: nonpositive value(s).")
return newspec
from mpl_toolkits.mplot3d import Axes3D from scipy.interpolate import InterpolatedUnivariateSpline as ip from scipy.optimize import fsolve import matplotlib.cm as cm folfits="../../" lxpc=3 ra0 = 83.63 dec0 = 22.01 full = False sz= 100 fnamera = folfits + "LX" + str(lxpc) + "0_RA.txt" fnamedec = folfits + "LX" + str(lxpc) + "0_Dec.txt" tlpcr,raval = np.genfromtxt(fnamera,skip_header=1,unpack=True) ipr = ip(tlpcr,raval,k=2) drr = lambda z : ipr.derivatives(z)[1] tlrmax = fsolve(drr,16879)[0] # Note that I am using my maximas instead of #the ones given in Table 2 of Antia's paper. Cursory examination shows #difference to be minimal - must shift to Table 2 vals soon tlpcd,decval = np.genfromtxt(fnamedec,skip_header=1,unpack=True) ipd = ip(tlpcd,decval,k=2) ddr = lambda z : ipd.derivatives(z)[1] tldmax = fsolve(ddr,29226)[0] tra,ra = np.genfromtxt(folfits + 'rascan.txt',skip_header=1,unpack=True) tdec,dec = np.genfromtxt(folfits + 'decscan.txt',skip_header=1,unpack=True) poltra = np.polyfit(ra-ra0,tra,1) poltdec = np.polyfit(dec-dec0,tdec,1)#Inverting the variables for linfit fra = np.poly1d(poltra) fdec = np.poly1d(poltdec)
