def parse_text_header(self, Table):
"""
Grab relevant parameters from a table header (xaxis type, etc)
This function should only exist for Spectrum objects created from
.txt or other atpy table type objects
"""
self.Table = Table
xtype = Table.data.dtype.names[Table.xaxcol]
if xtype in units.xtype_dict.values():
self.xarr.xtype = xtype
self.xarr.units = Table.columns[xtype].unit
elif xtype in units.xtype_dict:
self.xarr.xtype = units.xtype_dict[xtype]
self.xarr.units = Table.columns[xtype].unit
else:
warn(
"Warning: Invalid xtype in text header - this may mean no text header was available. X-axis units will be pixels unless you set them manually (e.g., sp.xarr.unit='angstroms')"
)
self.xarr.xtype = 'pixels'
self.xarr.units = 'none'
#raise ValueError("Invalid xtype in text header")
self.ytype = Table.data.dtype.names[Table.datacol]
try:
self.units = Table.columns[self.ytype].unit
except ValueError:
self.units = None
pass # astropy 0.2.dev11 introduces an incompatibility here
self.header = pyfits.Header()
self._update_header()
def parse_text_header(self, Table):
"""
Grab relevant parameters from a table header (xaxis type, etc)
This function should only exist for Spectrum objects created from
.txt or other atpy table type objects
"""
self.Table = Table
xtype = Table.data.dtype.names[Table.xaxcol]
if xtype in units.xtype_dict.values():
self.xarr.xtype = xtype
self.xarr.units = Table.columns[xtype].unit
elif xtype in units.xtype_dict:
self.xarr.xtype = units.xtype_dict[xtype]
self.xarr.units = Table.columns[xtype].unit
else:
warn(
"Warning: Invalid xtype in text header - this may mean no text header was available. X-axis units will be pixels unless you set them manually (e.g., sp.xarr.unit='angstroms')"
)
self.xarr.xtype = "pixels"
self.xarr.units = "none"
# raise ValueError("Invalid xtype in text header")
self.ytype = Table.data.dtype.names[Table.datacol]
try:
self.units = Table.columns[self.ytype].unit
except ValueError:
self.units = None
pass # astropy 0.2.dev11 introduces an incompatibility here
self.header = pyfits.Header()
self._update_header()
def __init__(self, speclist, xunits="GHz", **kwargs):
print "Creating spectra"
speclist = list(speclist)
for ii, spec in enumerate(speclist):
if type(spec) is str:
spec = Spectrum(spec)
speclist[ii] = spec
self.speclist = speclist
print "Concatenating data"
self.xarr = units.SpectroscopicAxes([sp.xarr.as_unit(xunits) for sp in speclist])
self.xarr.units = xunits
self.xarr.xtype = units.unit_type_dict[xunits]
self.data = np.ma.concatenate([sp.data for sp in speclist])
self.error = np.ma.concatenate([sp.error for sp in speclist])
self._sort()
self.header = pyfits.Header()
for spec in speclist:
for key, value in spec.header.items():
try:
self.header.update(key, value)
except ValueError, KeyError:
warn("Could not update header KEY=%s to VALUE=%s" % (key, value))
def make_multispec_axis(hdr, axsplit, WAT1_dict):
num,beam,dtype,crval,cdelt,naxis,z,aplow,aphigh = axsplit[:9]
# this is a hack for cropped spectra...
#print "header naxis: %i, WAT naxis: %i" % (hdr['NAXIS1'], int(naxis))
if hdr['NAXIS1'] != int(naxis):
crpix = int(naxis) - hdr['NAXIS']
naxis = hdr['NAXIS1']
warn("Treating as cropped echelle spectrum.")
else:
crpix = 0
if len(axsplit) > 9:
functions = axsplit[9:]
warn("Found but did not use functions %s" % str(functions))
if int(dtype) == 0:
# Linear dispersion (eq 11, p.9 from Valdez, linked above)
xax = (float(crval) + float(cdelt) * (np.arange(int(naxis)))) / (1.+float(z))
elif int(dtype) == 1:
# Log-linear dispersion (eq 12, p.9 from Valdez, linked above)
xax = 10.**(float(crval) + float(cdelt) * (np.arange(int(naxis)))) / (1.+float(z))
# elif int(dtype) == 2:
# Non-linear dispersion
# elif int(dtype) == -1:
# Data is not dispersion coords
else: raise ValueError("Unrecognized MULTISPE dispersion in IRAF Echelle specification")
headerkws = {'CRPIX1':1, 'CRVAL1':crval, 'CDELT1':cdelt, 'NAXIS1':naxis, 'NAXIS':1, 'REDSHIFT':z, 'CTYPE1':'wavelength', 'CUNIT1':WAT1_dict['units']}
return xax, naxis, headerkws
def make_linear_axis(hdr, axsplit, WAT1_dict):
num, beam, dtype, crval, cdelt, naxis, z, aplow, aphigh = axsplit[:9]
# this is a hack for cropped spectra...
#print "header naxis: %i, WAT naxis: %i" % (hdr['NAXIS1'], int(naxis))
if hdr['NAXIS1'] != int(naxis):
naxis = hdr['NAXIS1']
crpix = hdr.get('CRPIX1')
warn("Treating as cropped echelle spectrum.")
else:
crpix = 0
if len(axsplit) > 9:
functions = axsplit[9:]
warn("Found but did not use functions %s" % str(functions))
if int(dtype) == 0:
# Linear dispersion (eq 2, p.5 from Valdez, linked above)
xax = ((float(crval) + float(cdelt) *
(np.arange(int(naxis)) + 1 - crpix)) / (1. + float(z)))
else:
raise ValueError(
"Unrecognized LINEAR dispersion in IRAF Echelle specification")
headerkws = {
'CRPIX1': 1,
'CRVAL1': crval,
'CDELT1': cdelt,
'NAXIS1': naxis,
'NAXIS': 1,
'REDSHIFT': z,
'CTYPE1': 'wavelength',
'CUNIT1': WAT1_dict['units']
}
return xax, naxis, headerkws
def line_ids_from_measurements(self,
auto_yloc=True,
auto_yloc_fraction=0.9,
**kwargs):
"""
Add line ID labels to a plot using lineid_plot
http://oneau.wordpress.com/2011/10/01/line-id-plot/
https://github.com/phn/lineid_plot
http://packages.python.org/lineid_plot/
Parameters
----------
auto_yloc : bool
If set, overrides box_loc and arrow_tip (the vertical position of
the lineid labels) in kwargs to be `auto_yloc_fraction` of the plot
range
auto_yloc_fraction: float in range [0,1]
The fraction of the plot (vertically) at which to place labels
Examples
--------
>>> import numpy as np
>>> import pyspeckit
>>> sp = pyspeckit.Spectrum(
xarr=pyspeckit.units.SpectroscopicAxis(np.linspace(-50,50,101),
units='km/s', refX=6562.8, refX_unit='angstroms'),
data=np.random.randn(101), error=np.ones(101))
>>> sp.plotter()
>>> sp.specfit(multifit=None, fittype='gaussian', guesses=[1,0,1]) # fitting noise....
>>> sp.measure()
>>> sp.plotter.line_ids_from_measurements()
"""
import lineid_plot
if hasattr(self.Spectrum, 'measurements'):
measurements = self.Spectrum.measurements
if auto_yloc:
yr = self.axis.get_ylim()
kwargs['box_loc'] = (yr[1] -
yr[0]) * auto_yloc_fraction + yr[0]
kwargs['arrow_tip'] = (yr[1] - yr[0]) * (auto_yloc_fraction *
0.9) + yr[0]
lineid_plot.plot_line_ids(
self.Spectrum.xarr,
self.Spectrum.data,
[v['pos'] for v in measurements.lines.values()],
measurements.lines.keys(),
ax=self.axis,
**kwargs)
else:
warn(
"Cannot add line IDs from measurements unless measurements have been made!"
)
def write_history(header, string):
"""
Add a line to the header's history
"""
if not isinstance(header, pyfits.Header):
warn("header is not a header instance!")
hdrstring = time.strftime("%m/%d/%y %H:%M:%S",time.localtime()) + " " + string
try:
header.add_history(hdrstring)
except AttributeError:
print "WARNING: Error in history writing. Could not add this string: %s" % hdrstring
def read_echelle(pyfits_hdu):
"""
Read an IRAF Echelle spectrum
http://iraf.noao.edu/iraf/ftp/iraf/docs/specwcs.ps.Z
"""
hdr = pyfits_hdu.header
WAT1_dict, specaxdict = _get_WATS(hdr)
x_axes = []
for specnum, axstring in specaxdict.iteritems():
axsplit = axstring.replace('"', '').split()
if specnum != int(axsplit[0]):
raise ValueError("Mismatch in IRAF Echelle specification")
num, beam, dtype, crval, cdelt, naxis, z, aplow, aphigh = axsplit[:9]
# this is a hack for cropped spectra...
#print "header naxis: %i, WAT naxis: %i" % (hdr['NAXIS1'], int(naxis))
if hdr['NAXIS1'] != int(naxis):
naxis = hdr['NAXIS1']
crpix = hdr.get('CRPIX1')
warn("Treating as cropped echelle spectrum.")
else:
crpix = 0
if len(axsplit) > 9:
functions = axsplit[9:]
warn("Found but did not use functions %s" % str(functions))
if int(dtype) == 0:
xax = (float(crval) + float(cdelt) *
(np.arange(int(naxis)) + 1 - crpix)) / (1. + float(z))
headerkws = {
'CRPIX1': 1,
'CRVAL1': crval,
'CDELT1': cdelt,
'NAXIS1': naxis,
'NAXIS': 1,
'REDSHIFT': z,
'CTYPE1': 'wavelength',
'CUNIT1': WAT1_dict['units']
}
cards = [pyfits.Card(k, v) for (k, v) in headerkws.iteritems()]
header = pyfits.Header(cards)
xarr = make_axis(xax, header)
x_axes.append(xarr)
return pyfits_hdu.data, pyfits_hdu.data * 0, units.EchelleAxes(x_axes), hdr
def write_history(header, string):
"""
Add a line to the header's history
"""
if not isinstance(header, pyfits.Header):
warn("header is not a header instance!")
hdrstring = time.strftime("%m/%d/%y %H:%M:%S",
time.localtime()) + " " + string
try:
header.add_history(hdrstring)
except AttributeError:
print "WARNING: Error in history writing. Could not add this string: %s" % hdrstring
def make_axis(xarr,hdr,specname=None, wcstype='', specaxis="1", verbose=True,
**kwargs):
"""
Parse parameters from a .fits header into required SpectroscopicAxis
parameters
"""
#DEBUG if wcstype is not '': print "Loading file with WCSTYPE %s" % wcstype
xunits = hdr.get('CUNIT%s%s' % (specaxis,wcstype))
if hdr.get('ORIGIN') == 'CLASS-Grenoble' and xunits is None:
# CLASS default
xunits = 'Hz'
# SDSS doesn't use FITS standard! Argh.
if hdr.get('TELESCOP') == 'SDSS 2.5-M':
xunits = 'angstrom'
# IRAF also doesn't use the same standard
if xunits is None:
if hdr.get('WAT1_001') is not None:
pairs = hdr.get('WAT1_001').split()
pdict = dict( [s.split("=") for s in pairs] )
if 'units' in pdict:
xunits = pdict['units']
if hdr.get('REFFREQ'+wcstype):
refX = hdr.get('REFFREQ'+wcstype)
elif hdr.get('RESTFREQ'+wcstype):
refX = hdr.get('RESTFREQ'+wcstype)
elif hdr.get('RESTFRQ'+wcstype):
refX = hdr.get('RESTFRQ'+wcstype)
else:
if verbose: warn( "Warning: No reference frequency found. Velocity transformations will not be possible unless you set a reference frequency/wavelength" )
refX = None
if hdr.get('CTYPE%s%s' % (specaxis,wcstype)):
xtype = hdr.get('CTYPE%s%s' % (specaxis,wcstype))
else:
xtype = 'VLSR'
if hdr.get('VELDEF'):
convention, frame = units.parse_veldef(hdr['VELDEF'])
vframe = hdr.get('VFRAME') if hdr.get('VFRAME') is not None else 0.0
else:
convention, frame = _parse_velocity_convention(hdr.get('CTYPE%s%s' % (specaxis,wcstype))), None
vframe = 0.0
XAxis = units.SpectroscopicAxis(xarr, xunits, refX=refX,
velocity_convention=convention, **kwargs)
return XAxis
def line_ids_from_measurements(self, auto_yloc=True,
auto_yloc_fraction=0.9, **kwargs):
"""
Add line ID labels to a plot using lineid_plot
http://oneau.wordpress.com/2011/10/01/line-id-plot/
https://github.com/phn/lineid_plot
http://packages.python.org/lineid_plot/
Parameters
----------
auto_yloc : bool
If set, overrides box_loc and arrow_tip (the vertical position of
the lineid labels) in kwargs to be `auto_yloc_fraction` of the plot
range
auto_yloc_fraction: float in range [0,1]
The fraction of the plot (vertically) at which to place labels
Examples
--------
>>> import numpy as np
>>> import pyspeckit
>>> sp = pyspeckit.Spectrum(
xarr=pyspeckit.units.SpectroscopicAxis(np.linspace(-50,50,101),
units='km/s', refX=6562.8, refX_units='angstroms'),
data=np.random.randn(101), error=np.ones(101))
>>> sp.plotter()
>>> sp.specfit(multifit=True, fittype='gaussian', guesses=[1,0,1]) # fitting noise....
>>> sp.measure()
>>> sp.plotter.line_ids_from_measurements()
"""
import lineid_plot
if hasattr(self.Spectrum,'measurements'):
measurements = self.Spectrum.measurements
if auto_yloc:
yr = self.axis.get_ylim()
kwargs['box_loc'] = (yr[1]-yr[0])*auto_yloc_fraction + yr[0]
kwargs['arrow_tip'] = (yr[1]-yr[0])*(auto_yloc_fraction*0.9) + yr[0]
lineid_plot.plot_line_ids(self.Spectrum.xarr,
self.Spectrum.data,
[v['pos'] for v in measurements.lines.values()],
measurements.lines.keys(),
ax=self.axis,
**kwargs)
else:
warn("Cannot add line IDs from measurements unless measurements have been made!")
def read_echelle(pyfits_hdu):
"""
Read an IRAF Echelle spectrum
http://iraf.noao.edu/iraf/ftp/iraf/docs/specwcs.ps.Z
"""
hdr = pyfits_hdu.header
WAT1_dict, specaxdict = _get_WATS(hdr)
x_axes = []
for specnum, axstring in specaxdict.iteritems():
axsplit = axstring.replace('"','').split()
if specnum != int(axsplit[0]):
raise ValueError("Mismatch in IRAF Echelle specification")
num,beam,dtype,crval,cdelt,naxis,z,aplow,aphigh = axsplit[:9]
# this is a hack for cropped spectra...
#print "header naxis: %i, WAT naxis: %i" % (hdr['NAXIS1'], int(naxis))
if hdr['NAXIS1'] != int(naxis):
naxis = hdr['NAXIS1']
crpix = hdr.get('CRPIX1')
warn("Treating as cropped echelle spectrum.")
else:
crpix = 0
if len(axsplit) > 9:
functions = axsplit[9:]
warn("Found but did not use functions %s" % str(functions))
if int(dtype) == 0:
xax = ( float(crval) + float(cdelt) * (np.arange(int(naxis)) + 1 - crpix) ) / (1.+float(z))
headerkws = {'CRPIX1':1, 'CRVAL1':crval, 'CDELT1':cdelt,
'NAXIS1':naxis, 'NAXIS':1, 'REDSHIFT':z,
'CTYPE1':'wavelength', 'CUNIT1':WAT1_dict['units']}
cards = [pyfits.Card(k,v) for (k,v) in headerkws.iteritems()]
header = pyfits.Header(cards)
xarr = make_axis(xax,header)
x_axes.append(xarr)
return pyfits_hdu.data, pyfits_hdu.data*0, units.EchelleAxes(x_axes), hdr
def __init__(self, speclist, xunits='GHz', **kwargs):
print "Creating spectra"
speclist = list(speclist)
for ii, spec in enumerate(speclist):
if type(spec) is str:
spec = Spectrum(spec)
speclist[ii] = spec
self.speclist = speclist
print "Concatenating data"
self.xarr = units.SpectroscopicAxes(
[sp.xarr.as_unit(xunits) for sp in speclist])
self.xarr.units = xunits
self.xarr.xtype = units.unit_type_dict[xunits]
self.data = np.ma.concatenate([sp.data for sp in speclist])
self.error = np.ma.concatenate([sp.error for sp in speclist])
self._sort()
self.header = pyfits.Header()
for spec in speclist:
for key, value in spec.header.items():
try:
self.header[key] = value
except (ValueError, KeyError):
warn("Could not update header KEY=%s to VALUE=%s" %
(key, value))
self.plotter = plotters.Plotter(self)
self._register_fitters()
self.specfit = fitters.Specfit(self, Registry=self.Registry)
self.baseline = baseline.Baseline(self)
self.units = speclist[0].units
for spec in speclist:
if spec.units != self.units:
raise ValueError("Mismatched units")
# Special. This needs to be modified to be more flexible; for now I need it to work for nh3
self.plot_special = None
self.plot_special_kwargs = {}
def __init__(self, speclist, xunits='GHz', **kwargs):
print "Creating spectra"
speclist = list(speclist)
for ii,spec in enumerate(speclist):
if type(spec) is str:
spec = Spectrum(spec)
speclist[ii] = spec
self.speclist = speclist
print "Concatenating data"
self.xarr = units.SpectroscopicAxes([sp.xarr.as_unit(xunits) for sp in speclist])
self.xarr.units = xunits
self.xarr.xtype = units.unit_type_dict[xunits]
self.data = np.ma.concatenate([sp.data for sp in speclist])
self.error = np.ma.concatenate([sp.error for sp in speclist])
self._sort()
self.header = pyfits.Header()
for spec in speclist:
for key,value in spec.header.items():
try:
self.header[key] = value
except (ValueError, KeyError):
warn("Could not update header KEY=%s to VALUE=%s" % (key,value))
self.plotter = plotters.Plotter(self)
self._register_fitters()
self.specfit = fitters.Specfit(self,Registry=self.Registry)
self.baseline = baseline.Baseline(self)
self.unit = speclist[0].units
for spec in speclist:
if spec.unit != self.unit:
raise ValueError("Mismatched units")
# Special. This needs to be modified to be more flexible; for now I need it to work for nh3
self.plot_special = None
self.plot_special_kwargs = {}
def open_1d_txt(filename,
xaxcol=0,
datacol=1,
errorcol=2,
text_reader='simple',
atpytype='ascii',
**kwargs):
"""
Attempt to read a 1D spectrum from a text file assuming wavelength as the
first column, data as the second, and (optionally) error as the third.
Reading can be done either with atpy or a 'simple' reader. If you have an
IPAC, CDS, or formally formatted table, you'll want to use atpy.
If you have a simply formatted file of the form, e.g.
# name name
# unit unit
data data
data data
kwargs are passed to atpy.Table
"""
if text_reader in ('simple', 'readcol') or not atpyOK:
if not atpyOK:
warn(
"WARNING: atpy not installed; will use simple reader instead.")
if text_reader == 'simple':
data, error, XAxis, T = simple_txt(filename,
xaxcol=xaxcol,
datacol=datacol,
errorcol=errorcol,
**kwargs)
elif text_reader == 'readcol':
Tlist = readcol.readcol(filename, twod=False, **kwargs)
XAxis = units.SpectroscopicAxis(Tlist[xaxcol])
data = Tlist[datacol]
error = Tlist[errorcol]
T = dummy_class()
Tdict = readcol.readcol(filename, asDict=True, **kwargs)
T.data = dummy_class()
T.data.dtype = dummy_class()
T.data.dtype.names = hdr
T.columns = {}
T.columns[T.data.dtype.names[xaxcol]] = dummy_class()
T.columns[T.data.dtype.names[xaxcol]].unit = colunits[xaxcol]
T.columns[T.data.dtype.names[datacol]] = dummy_class()
T.columns[T.data.dtype.names[datacol]].unit = colunits[datacol]
elif text_reader in ('atpy', 'asciitable'):
T = atpy.Table(filename, type=atpytype, masked=True, **kwargs)
xarr = T.data[T.data.dtype.names[xaxcol]]
data = T.data[T.data.dtype.names[datacol]]
if len(T.columns) > errorcol:
error = T.data[T.data.dtype.names[errorcol]]
else:
# assume uniform, zero error
error = data * 0
if 'xunits' in T.keywords:
xunits = T.keywords['xunits']
else:
xunits = 'unknown'
XAxis = units.SpectroscopicAxis(xarr, xunits)
# Need this in Spectrum class to correctly parse header
T.xaxcol = xaxcol
T.datacol = datacol
return data, error, XAxis, T
"""
import numpy as np
from pyspeckit.mpfit import mpfit,mpfitException
from pyspeckit.spectrum.parinfo import ParinfoList,Parinfo
import copy
from astropy import log
import matplotlib.cbook as mpcb
from . import fitter
from . import mpfit_messages
from pyspeckit.specwarnings import warn
try:
from collections import OrderedDict
except ImportError:
from ordereddict import OrderedDict
except ImportError:
warn( "OrderedDict is required for modeling. If you have python <2.7, install the ordereddict module." )
class SpectralModel(fitter.SimpleFitter):
"""
A wrapper class for a spectra model. Includes internal functions to
generate multi-component models, annotations, integrals, and individual
components. The declaration can be complex, since you should name
individual variables, set limits on them, set the units the fit will be
performed in, and set the annotations to be used. Check out some
of the hyperfine codes (hcn, n2hp) for examples.
"""
def __init__(self, modelfunc, npars,
shortvarnames=("A","\\Delta x","\\sigma"),
fitunits=None,
centroid_par=None,
def lmfitter(self, xax, data, err=None, parinfo=None, quiet=True, debug=False, **kwargs):
"""
Use lmfit instead of mpfit to do the fitting
Parameters
----------
xax : SpectroscopicAxis
The X-axis of the spectrum
data : ndarray
The data to fit
err : ndarray (optional)
The error on the data. If unspecified, will be uniform unity
parinfo : ParinfoList
The guesses, parameter limits, etc. See
`pyspeckit.spectrum.parinfo` for details
quiet : bool
If false, print out some messages about the fitting
"""
try:
import lmfit
except ImportError as e:
raise ImportError( "Could not import lmfit, try using mpfit instead." )
self.xax = xax # the 'stored' xax is just a link to the original
if hasattr(xax,'convert_to_unit') and self.fitunits is not None:
# some models will depend on the input units. For these, pass in an X-axis in those units
# (gaussian, voigt, lorentz profiles should not depend on units. Ammonia, formaldehyde,
# H-alpha, etc. should)
xax = copy.copy(xax)
xax.convert_to_unit(self.fitunits, quiet=quiet)
elif self.fitunits is not None:
raise TypeError("X axis does not have a convert method")
if np.any(np.isnan(data)) or np.any(np.isinf(data)):
err[np.isnan(data) + np.isinf(data)] = np.inf
data[np.isnan(data) + np.isinf(data)] = 0
if np.any(np.isnan(err)):
raise ValueError("One or more of the error values is NaN."
" This is not allowed. Errors can be infinite "
"(which is equivalent to giving zero weight to "
"a data point), but otherwise they must be positive "
"floats.")
elif np.any(err<0):
raise ValueError("At least one error value is negative, which is "
"not allowed as negative errors are not "
"meaningful in the optimization process.")
if parinfo is None:
parinfo, kwargs = self._make_parinfo(debug=debug, **kwargs)
log.debug("Parinfo created from _make_parinfo: {0}".format(parinfo))
LMParams = parinfo.as_Parameters()
log.debug("LMParams: "+"\n".join([repr(p) for p in list(LMParams.values())]))
log.debug("parinfo: {0}".format(parinfo))
minimizer = lmfit.minimize(self.lmfitfun(xax,np.array(data),err,debug=debug),LMParams,**kwargs)
if not quiet:
log.info("There were %i function evaluations" % (minimizer.nfev))
#modelpars = [p.value for p in parinfo.values()]
#modelerrs = [p.stderr for p in parinfo.values() if p.stderr is not None else 0]
self.LMParams = LMParams
self.parinfo._from_Parameters(LMParams)
log.debug("LMParams: {0}".format(LMParams))
log.debug("parinfo: {0}".format(parinfo))
self.mp = minimizer
self.mpp = self.parinfo.values
self.mpperr = self.parinfo.errors
self.mppnames = self.parinfo.names
modelkwargs = {}
modelkwargs.update(self.modelfunc_kwargs)
self.model = self.n_modelfunc(self.parinfo, **modelkwargs)(xax)
if hasattr(minimizer,'chisqr'):
chi2 = minimizer.chisqr
else:
try:
chi2 = (((data-self.model)/err)**2).sum()
except TypeError:
chi2 = ((data-self.model)**2).sum()
if np.isnan(chi2):
warn( "Warning: chi^2 is nan" )
if hasattr(self.mp,'ier') and self.mp.ier not in [1,2,3,4]:
log.warning("Fitter failed: %s, %s" % (self.mp.message, self.mp.lmdif_message))
return self.mpp,self.model,self.mpperr,chi2
import numpy as np
from pyspeckit.mpfit import mpfit, mpfitException
from pyspeckit.spectrum.parinfo import ParinfoList, Parinfo
import copy
from astropy import log
import matplotlib.cbook as mpcb
from . import fitter
from . import mpfit_messages
from pyspeckit.specwarnings import warn
try:
from collections import OrderedDict
except ImportError:
from ordereddict import OrderedDict
except ImportError:
warn(
"OrderedDict is required for modeling. If you have python <2.7, install the ordereddict module."
)
class SpectralModel(fitter.SimpleFitter):
"""
A wrapper class for a spectra model. Includes internal functions to
generate multi-component models, annotations, integrals, and individual
components. The declaration can be complex, since you should name
individual variables, set limits on them, set the units the fit will be
performed in, and set the annotations to be used. Check out some
of the hyperfine codes (hcn, n2hp) for examples.
"""
def __init__(self,
modelfunc,
npars,
def lmfitter(self,
xax,
data,
err=None,
parinfo=None,
quiet=True,
debug=False,
**kwargs):
"""
Use lmfit instead of mpfit to do the fitting
Parameters
----------
xax : SpectroscopicAxis
The X-axis of the spectrum
data : ndarray
The data to fit
err : ndarray (optional)
The error on the data. If unspecified, will be uniform unity
parinfo : ParinfoList
The guesses, parameter limits, etc. See
`pyspeckit.spectrum.parinfo` for details
quiet : bool
If false, print out some messages about the fitting
"""
try:
import lmfit
except ImportError as e:
raise ImportError(
"Could not import lmfit, try using mpfit instead.")
self.xax = xax # the 'stored' xax is just a link to the original
if hasattr(xax, 'convert_to_unit') and self.fitunits is not None:
# some models will depend on the input units. For these, pass in an X-axis in those units
# (gaussian, voigt, lorentz profiles should not depend on units. Ammonia, formaldehyde,
# H-alpha, etc. should)
xax = copy.copy(xax)
xax.convert_to_unit(self.fitunits, quiet=quiet)
elif self.fitunits is not None:
raise TypeError("X axis does not have a convert method")
if np.any(np.isnan(data)) or np.any(np.isinf(data)):
err[np.isnan(data) + np.isinf(data)] = np.inf
data[np.isnan(data) + np.isinf(data)] = 0
if np.any(np.isnan(err)):
raise ValueError(
"One or more of the error values is NaN."
" This is not allowed. Errors can be infinite "
"(which is equivalent to giving zero weight to "
"a data point), but otherwise they must be positive "
"floats.")
elif np.any(err < 0):
raise ValueError("At least one error value is negative, which is "
"not allowed as negative errors are not "
"meaningful in the optimization process.")
if parinfo is None:
parinfo, kwargs = self._make_parinfo(debug=debug, **kwargs)
log.debug(
"Parinfo created from _make_parinfo: {0}".format(parinfo))
LMParams = parinfo.as_Parameters()
log.debug("LMParams: " +
"\n".join([repr(p) for p in list(LMParams.values())]))
log.debug("parinfo: {0}".format(parinfo))
minimizer = lmfit.minimize(
self.lmfitfun(xax, np.array(data), err, debug=debug), LMParams,
**kwargs)
if not quiet:
log.info("There were %i function evaluations" % (minimizer.nfev))
#modelpars = [p.value for p in parinfo.values()]
#modelerrs = [p.stderr for p in parinfo.values() if p.stderr is not None else 0]
self.LMParams = LMParams
self.parinfo._from_Parameters(LMParams)
log.debug("LMParams: {0}".format(LMParams))
log.debug("parinfo: {0}".format(parinfo))
self.mp = minimizer
self.mpp = self.parinfo.values
self.mpperr = self.parinfo.errors
self.mppnames = self.parinfo.names
modelkwargs = {}
modelkwargs.update(self.modelfunc_kwargs)
self.model = self.n_modelfunc(self.parinfo, **modelkwargs)(xax)
if hasattr(minimizer, 'chisqr'):
chi2 = minimizer.chisqr
else:
try:
chi2 = (((data - self.model) / err)**2).sum()
except TypeError:
chi2 = ((data - self.model)**2).sum()
if np.isnan(chi2):
warn("Warning: chi^2 is nan")
if hasattr(self.mp, 'ier') and self.mp.ier not in [1, 2, 3, 4]:
log.warning("Fitter failed: %s, %s" %
(self.mp.message, self.mp.lmdif_message))
return self.mpp, self.model, self.mpperr, chi2
def __init__(
self,
filename=None,
filetype=None,
xarr=None,
data=None,
error=None,
header=None,
doplot=False,
maskdata=True,
plotkwargs={},
xarrkwargs={},
**kwargs
):
"""
Create a Spectrum object.
Must either pass in a filename or ALL of xarr, data, and header, plus
optionally error.
kwargs are passed to the file reader
Parameters
----------
filename : string or pyfits.HDU
The file to read the spectrum from. If data, xarr, and error are
specified, leave filename blank.
filetype : string
Specify the file type (only needed if it cannot be automatically
determined from the filename)
xarr : `units.SpectroscopicAxis` or `np.ndarray`
The X-axis of the data. If it is an np.ndarray, you must pass
`xarrkwargs` or a valid header if you want to use any of the unit
functionality.
data : `np.ndarray`
The data array (must have same length as xarr)
error : `np.ndarray`
The error array (must have same length as the data and xarr arrays)
header : `pyfits.Header` or dict
The header from which to read unit information. Needs to be a
`pyfits.Header` instance or another dictionary-like object with the
appropriate information
maskdata : boolean
turn the array into a masked array with all nan and inf values masked
doplot : boolean
Plot the spectrum after loading it?
plotkwargs : dict
keyword arguments to pass to the plotter
xarrkwargs : dict
keyword arguments to pass to the SpectroscopicAxis initialization
(can be used in place of a header)
Examples
--------
>>> sp = pyspeckit.Spectrum(data=np.random.randn(100),
xarr=np.linspace(-50, 50, 100), error=np.ones(100)*0.1,
xarrkwargs={'unit':'km/s', 'refX':4.829, 'refX_units':'GHz',
'xtype':'VLSR-RAD'}, header={})
>>> xarr = pyspeckit.units.SpectroscopicAxis(np.linspace(-50,50,100),
units='km/s', refX=6562.83, refX_units='angstroms')
>>> data = np.random.randn(100)*5 + np.random.rand(100)*100
>>> err = np.sqrt(data/5.)*5. # Poisson noise
>>> sp = pyspeckit.Spectrum(data=data, error=err, xarr=xarr, header={})
>>> # if you already have a simple fits file
>>> sp = pyspeckit.Spectrum('test.fits')
"""
if filename:
if filetype is None:
suffix = filename.rsplit(".", 1)[1]
if suffix in readers.suffix_types:
# use the default reader for that suffix
filetype = readers.suffix_types[suffix][0]
reader = readers.readers[filetype]
else:
raise TypeError("File with suffix %s is not recognized." % suffix)
else:
if filetype in readers.readers:
reader = readers.readers[filetype]
else:
raise TypeError("Filetype %s not recognized" % filetype)
self.data, self.error, self.xarr, self.header = reader(filename, **kwargs)
# these should probably be replaced with registerable function s...
if filetype in ("fits", "tspec", "pyfits", "sdss"):
self.parse_header(self.header)
elif filetype is "txt":
self.parse_text_header(self.header)
elif filetype in ("hdf5", "h5"):
self.parse_hdf5_header(self.header)
if isinstance(filename, str):
self.fileprefix = filename.rsplit(".", 1)[0] # Everything prior to .fits or .txt
elif xarr is not None and data is not None:
# technically, this is unpythonic. But I don't want to search for all 10 attributes required.
if issubclass(type(xarr), units.SpectroscopicAxis):
self.xarr = xarr
else:
self.xarr = units.SpectroscopicAxis(xarr, **xarrkwargs)
self.data = data
if error is not None:
self.error = error
else:
self.error = data * 0
if hasattr(header, "get"):
self.header = header
else: # set as blank
warn("WARNING: Blank header.")
self.header = pyfits.Header()
self.parse_header(self.header)
if maskdata:
if hasattr(self.data, "mask"):
self.data.mask += np.isnan(self.data) + np.isinf(self.data)
self.error.mask += np.isnan(self.data) + np.isinf(self.data)
else:
self.data = np.ma.masked_where(np.isnan(self.data) + np.isinf(self.data), self.data)
self.error = np.ma.masked_where(np.isnan(self.data) + np.isinf(self.data), self.error)
self.plotter = plotters.Plotter(self)
self._register_fitters()
self.specfit = fitters.Specfit(self, Registry=self.Registry)
self.baseline = baseline.Baseline(self)
self.speclines = speclines
self._sort()
# Special. This needs to be modified to be more flexible; for now I need it to work for nh3
self.plot_special = None
self.plot_special_kwargs = {}
if doplot:
self.plotter(**plotkwargs)
def reset_limits(self,
xmin=None,
xmax=None,
ymin=None,
ymax=None,
reset_xlimits=True,
reset_ylimits=True,
ypeakscale=1.2,
silent=None,
use_window_limits=False,
**kwargs):
"""
Automatically or manually reset the plot limits
"""
# if not use_window_limits: use_window_limits = False
if self.debug:
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
print zip(args, values)
if use_window_limits:
# this means DO NOT reset!
# it simply sets self.[xy][min/max] = current value
self.set_limits_from_visible_window()
else:
if silent is not None:
self.silent = silent
# if self.xmin and self.xmax:
if (reset_xlimits or self.Spectrum.xarr.min().value < self.xmin
or self.Spectrum.xarr.max().value > self.xmax):
if not self.silent:
warn(
"Resetting X-axis min/max because the plot is out of bounds."
)
self.xmin = None
self.xmax = None
if xmin is not None: self.xmin = u.Quantity(xmin, self._xunit)
elif self.xmin is None:
self.xmin = u.Quantity(self.Spectrum.xarr.min().value,
self._xunit)
if xmax is not None: self.xmax = u.Quantity(xmax, self._xunit)
elif self.xmax is None:
self.xmax = u.Quantity(self.Spectrum.xarr.max().value,
self._xunit)
xpixmin = np.argmin(
np.abs(self.Spectrum.xarr.value - self.xmin.value))
xpixmax = np.argmin(
np.abs(self.Spectrum.xarr.value - self.xmax.value))
if xpixmin > xpixmax: xpixmin, xpixmax = xpixmax, xpixmin
elif xpixmin == xpixmax:
if reset_xlimits:
raise Exception(
"Infinite recursion error. Maybe there are no valid data?"
)
if not self.silent:
warn(
"ERROR: the X axis limits specified were invalid. Resetting."
)
self.reset_limits(reset_xlimits=True,
ymin=ymin,
ymax=ymax,
reset_ylimits=reset_ylimits,
ypeakscale=ypeakscale,
**kwargs)
return
if self.ymin and self.ymax:
# this is utter nonsense....
if (self.Spectrum.data.max() < self.ymin
or self.Spectrum.data.min() > self.ymax
or reset_ylimits):
if not self.silent and not reset_ylimits:
warn(
"Resetting Y-axis min/max because the plot is out of bounds."
)
self.ymin = None
self.ymax = None
if ymin is not None: self.ymin = ymin
elif self.ymin is None:
if hasattr(self.Spectrum.data, 'mask'):
yminval = self.Spectrum.data[xpixmin:xpixmax].min()
else:
yminval = np.nanmin(self.Spectrum.data[xpixmin:xpixmax])
# Increase the range fractionally. This means dividing a positive #, multiplying a negative #
if yminval < 0:
self.ymin = float(yminval) * float(ypeakscale)
else:
self.ymin = float(yminval) / float(ypeakscale)
if ymax is not None:
self.ymax = ymax
elif self.ymax is None:
if hasattr(self.Spectrum.data, 'mask'):
ymaxval = ((self.Spectrum.data[xpixmin:xpixmax]).max() -
self.ymin)
else:
ymaxval = (np.nanmax(self.Spectrum.data[xpixmin:xpixmax]) -
self.ymin)
if ymaxval > 0:
self.ymax = float(ymaxval) * float(ypeakscale) + self.ymin
else:
self.ymax = float(ymaxval) / float(ypeakscale) + self.ymin
self.ymin += self.offset
self.ymax += self.offset
self.axis.set_xlim(
self.xmin.value if hasattr(self.xmin, 'value') else self.xmin,
self.xmax.value if hasattr(self.xmax, 'value') else self.xmax)
self.axis.set_ylim(self.ymin, self.ymax)
def open_1d_txt(filename, xaxcol=0, datacol=1, errorcol=2,
text_reader='simple', atpytype='ascii', **kwargs):
"""
Attempt to read a 1D spectrum from a text file assuming wavelength as the
first column, data as the second, and (optionally) error as the third.
Reading can be done either with atpy or a 'simple' reader. If you have an
IPAC, CDS, or formally formatted table, you'll want to use atpy.
If you have a simply formatted file of the form, e.g.
# name name
# unit unit
data data
data data
kwargs are passed to atpy.Table
"""
if text_reader in ('simple','readcol') or not atpyOK:
if not atpyOK:
warn("WARNING: atpy not installed; will use simple reader instead.")
if text_reader == 'simple':
data, error, XAxis, T = simple_txt(filename, xaxcol = xaxcol,
datacol = datacol, errorcol = errorcol, **kwargs)
elif text_reader == 'readcol':
Tlist = readcol.readcol(filename, twod=False, **kwargs)
XAxis = units.SpectroscopicAxis(Tlist[xaxcol])
data = Tlist[datacol]
error = Tlist[errorcol]
T = dummy_class()
Tdict = readcol.readcol(filename, asDict=True, **kwargs)
T.data = dummy_class()
T.data.dtype = dummy_class()
T.data.dtype.names = hdr
T.columns = {}
T.columns[T.data.dtype.names[xaxcol]] = dummy_class()
T.columns[T.data.dtype.names[xaxcol]].unit = colunits[xaxcol]
T.columns[T.data.dtype.names[datacol]] = dummy_class()
T.columns[T.data.dtype.names[datacol]].unit = colunits[datacol]
elif text_reader in ('atpy','asciitable'):
T = atpy.Table(filename, type=atpytype, masked=True, **kwargs)
xarr = T.data[T.data.dtype.names[xaxcol]]
data = T.data[T.data.dtype.names[datacol]]
if len(T.columns) > errorcol:
error = T.data[T.data.dtype.names[errorcol]]
else:
# assume uniform, zero error
error = data*0
if 'xunits' in T.keywords:
xunits = T.keywords['xunits']
else:
xunits = 'unknown'
XAxis = units.SpectroscopicAxis(xarr,xunits)
# Need this in Spectrum class to correctly parse header
T.xaxcol = xaxcol
T.datacol = datacol
return data, error, XAxis, T
def open_1d_pyfits(pyfits_hdu,
specnum=0,
wcstype='',
specaxis="1",
errspecnum=None,
autofix=True,
scale_keyword=None,
scale_action=operator.div,
verbose=False,
apnum=0,
**kwargs):
"""
This is open_1d_fits but for a pyfits_hdu so you don't necessarily have to
open a fits file
"""
# force things that will be treated as strings to be strings
# this is primarily to avoid problems with variables being passed as unicode
wcstype = str(wcstype)
specaxis = str(specaxis)
hdr = pyfits_hdu._header
if autofix:
for card in hdr.cards:
try:
if verbose: card.verify('fix')
else: card.verify('silentfix')
except pyfits.VerifyError:
hdr.__delitem__(card.key)
data = pyfits_hdu.data
# search for the correct axis (may be 1 or 3, unlikely to be 2 or others)
# 1 = 1D spectrum
# 3 = "3D" spectrum with a single x,y point (e.g., JCMT smurf/makecube)
if hdr.get('NAXIS') > 1:
for ii in xrange(1, hdr.get('NAXIS') + 1):
ctype = hdr.get('CTYPE%i' % ii)
if ctype in units.xtype_dict:
specaxis = "%i" % ii
if hdr.get('NAXIS') == 2:
if hdr.get('WAT0_001') is not None:
if 'multispec' in hdr.get('WAT0_001'):
# treat as an Echelle spectrum from IRAF
warn("""
This looks like an Echelle spectrum. You may want to load it
using pyspeckit.wrappers.load_IRAF_multispec. The file will still
be successfully read if you continue, but the plotting and fitting packages
will run into errors.""")
return read_echelle(pyfits_hdu)
if isinstance(specnum, list):
# allow averaging of multiple spectra (this should be modified
# - each spectrum should be a Spectrum instance)
spec = ma.array(data[specnum, :]).mean(axis=0)
elif isinstance(specnum, int):
spec = ma.array(data[specnum, :]).squeeze()
else:
raise TypeError(
"Specnum is of wrong type (not a list of integers or an integer)."
+ " Type: %s" % str(type(specnum)))
if errspecnum is not None:
# SDSS supplies weights, not errors.
if hdr.get('TELESCOP') == 'SDSS 2.5-M':
errspec = 1. / np.sqrt(ma.array(data[errspecnum, :]).squeeze())
else:
errspec = ma.array(data[errspecnum, :]).squeeze()
else:
errspec = spec * 0 # set error spectrum to zero if it's not in the data
elif hdr.get('NAXIS') > 2:
if hdr.get('BANDID2'):
# this is an IRAF .ms.fits file with a 'background' in the 3rd dimension
spec = ma.array(data[specnum, apnum, :]).squeeze()
else:
for ii in xrange(3, hdr.get('NAXIS') + 1):
# only fail if extra axes have more than one row
if hdr.get('NAXIS%i' % ii) > 1:
raise ValueError("Too many axes for open_1d_fits")
spec = ma.array(data).squeeze()
if errspecnum is None:
errspec = spec * 0 # set error spectrum to zero if it's not in the data
else:
spec = ma.array(data).squeeze()
if errspecnum is None:
errspec = spec * 0 # set error spectrum to zero if it's not in the data
if scale_keyword is not None:
try:
print "Found SCALE keyword %s. Using %s to scale it" % (
scale_keyword, scale_action)
scaleval = hdr[scale_keyword]
spec = scale_action(spec, scaleval)
errspec = scale_action(errspec, scaleval)
except (ValueError, KeyError) as e:
pass
xarr = None
if hdr.get('ORIGIN') == 'CLASS-Grenoble':
# Use the CLASS FITS definition (which is non-standard)
# http://iram.fr/IRAMFR/GILDAS/doc/html/class-html/node84.html
# F(n) = RESTFREQ + CRVALi + ( n - CRPIXi ) * CDELTi
if verbose: print "Loading a CLASS .fits spectrum"
dv = -1 * hdr.get('CDELT1')
if hdr.get('RESTFREQ'):
v0 = hdr.get('RESTFREQ') + hdr.get('CRVAL1')
elif hdr.get('RESTF'):
v0 = hdr.get('RESTF') + hdr.get('CRVAL1')
else:
warn("CLASS file does not have RESTF or RESTFREQ")
p3 = hdr.get('CRPIX1')
elif hdr.get(str('CD%s_%s%s' % (specaxis, specaxis, wcstype))):
dv = hdr['CD%s_%s%s' % (specaxis, specaxis, wcstype)]
v0 = hdr['CRVAL%s%s' % (specaxis, wcstype)]
p3 = hdr['CRPIX%s%s' % (specaxis, wcstype)]
hdr['CDELT%s' % specaxis] = dv
if verbose:
print "Using the FITS CD matrix. PIX=%f VAL=%f DELT=%f" % (p3, v0,
dv)
elif hdr.get(str('CDELT%s%s' % (specaxis, wcstype))):
dv = hdr['CDELT%s%s' % (specaxis, wcstype)]
v0 = hdr['CRVAL%s%s' % (specaxis, wcstype)]
p3 = hdr['CRPIX%s%s' % (specaxis, wcstype)]
if verbose:
print "Using the FITS CDELT value. PIX=%f VAL=%f DELT=%f" % (
p3, v0, dv)
elif len(data.shape) > 1:
if verbose:
print "No CDELT or CD in header. Assuming 2D input with 1st line representing the spectral axis."
# try assuming first axis is X axis
if hdr.get('CUNIT%s%s' % (specaxis, wcstype)):
xarr = data[0, :]
spec = data[1, :]
if data.shape[0] > 2:
errspec = data[2, :]
else:
raise TypeError(
"Don't know what type of FITS file you've input; " +
"its header is not FITS compliant and it doesn't look like it "
+ "was written by pyspeckit.")
# Deal with logarithmic wavelength binning if necessary
if xarr is None:
if hdr.get('WFITTYPE') == 'LOG-LINEAR':
xconv = lambda v: 10**((v - p3 + 1) * dv + v0)
xarr = xconv(np.arange(len(spec)))
else:
xconv = lambda v: ((v - p3 + 1) * dv + v0)
xarr = xconv(np.arange(len(spec)))
# need to do something with this...
restfreq = hdr.get('RESTFREQ')
if restfreq is None: restfreq = hdr.get('RESTFRQ')
XAxis = make_axis(xarr, hdr, wcstype=wcstype, specaxis=specaxis, **kwargs)
return spec, errspec, XAxis, hdr
def reset_limits(self,xmin=None, xmax=None, ymin=None, ymax=None,
reset_xlimits=True, reset_ylimits=True, ypeakscale=1.2,
silent=None, use_window_limits=False, **kwargs):
"""
Automatically or manually reset the plot limits
"""
if self.debug:
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
print zip(args,values)
if use_window_limits:
# this means DO NOT reset!
# it simply sets self.[xy][min/max] = current value
self.set_limits_from_visible_window()
else:
if silent is not None:
self.silent = silent
if (self.Spectrum.xarr.max() < self.xmin or self.Spectrum.xarr.min() > self.xmax
or reset_xlimits):
if not self.silent: warn( "Resetting X-axis min/max because the plot is out of bounds." )
self.xmin = None
self.xmax = None
if xmin is not None: self.xmin = xmin
elif self.xmin is None: self.xmin=self.Spectrum.xarr.min()
if xmax is not None: self.xmax = xmax
elif self.xmax is None: self.xmax=self.Spectrum.xarr.max()
xpixmin = np.argmin(np.abs(self.Spectrum.xarr-self.xmin))
xpixmax = np.argmin(np.abs(self.Spectrum.xarr-self.xmax))
if xpixmin>xpixmax: xpixmin,xpixmax = xpixmax,xpixmin
elif xpixmin == xpixmax:
if not self.silent: warn( "ERROR: the X axis limits specified were invalid. Resetting." )
self.reset_limits(reset_xlimits=True, ymin=ymin, ymax=ymax,
reset_ylimits=reset_ylimits,
ypeakscale=ypeakscale, **kwargs)
return
if (self.Spectrum.data.max() < self.ymin or self.Spectrum.data.min() > self.ymax
or reset_ylimits):
if not self.silent and not reset_ylimits: warn( "Resetting Y-axis min/max because the plot is out of bounds." )
self.ymin = None
self.ymax = None
if ymin is not None: self.ymin = ymin
elif self.ymin is None:
if hasattr(self.Spectrum.data, 'mask'):
yminval = self.Spectrum.data[xpixmin:xpixmax].min()
else:
yminval = np.nanmin(self.Spectrum.data[xpixmin:xpixmax])
# Increase the range fractionally. This means dividing a positive #, multiplying a negative #
if yminval < 0:
self.ymin = float(yminval)*float(ypeakscale)
else:
self.ymin = float(yminval)/float(ypeakscale)
if ymax is not None: self.ymax = ymax
elif self.ymax is None:
if hasattr(self.Spectrum.data, 'mask'):
ymaxval = ((self.Spectrum.data[xpixmin:xpixmax]).max()-self.ymin)
else:
ymaxval = (np.nanmax(self.Spectrum.data[xpixmin:xpixmax])-self.ymin)
if ymaxval > 0:
self.ymax = float(ymaxval) * float(ypeakscale) + self.ymin
else:
self.ymax = float(ymaxval) / float(ypeakscale) + self.ymin
self.ymin += self.offset
self.ymax += self.offset
self.axis.set_xlim(self.xmin,self.xmax)
self.axis.set_ylim(self.ymin,self.ymax)
def reset_limits(self,xmin=None, xmax=None, ymin=None, ymax=None,
reset_xlimits=True, reset_ylimits=True, ypeakscale=1.2,
silent=None, use_window_limits=False, **kwargs):
"""
Automatically or manually reset the plot limits
"""
if self.debug:
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
print zip(args,values)
if use_window_limits:
# this means DO NOT reset!
# it simply sets self.[xy][min/max] = current value
self.set_limits_from_visible_window()
else:
if silent is not None:
self.silent = silent
if (self.Spectrum.xarr.max() < self.xmin or self.Spectrum.xarr.min() > self.xmax
or reset_xlimits):
if not self.silent: warn( "Resetting X-axis min/max because the plot is out of bounds." )
self.xmin = None
self.xmax = None
if xmin is not None: self.xmin = xmin
elif self.xmin is None: self.xmin=self.Spectrum.xarr.min()
if xmax is not None: self.xmax = xmax
elif self.xmax is None: self.xmax=self.Spectrum.xarr.max()
xpixmin = np.argmin(np.abs(self.Spectrum.xarr-self.xmin))
xpixmax = np.argmin(np.abs(self.Spectrum.xarr-self.xmax))
if xpixmin>xpixmax: xpixmin,xpixmax = xpixmax,xpixmin
elif xpixmin == xpixmax:
if not self.silent: warn( "ERROR: the X axis limits specified were invalid. Resetting." )
self.reset_limits(reset_xlimits=True, ymin=ymin, ymax=ymax,
reset_ylimits=reset_ylimits,
ypeakscale=ypeakscale, **kwargs)
return
if (self.Spectrum.data.max() < self.ymin or self.Spectrum.data.min() > self.ymax
or reset_ylimits):
if not self.silent and not reset_ylimits: warn( "Resetting Y-axis min/max because the plot is out of bounds." )
self.ymin = None
self.ymax = None
if ymin is not None: self.ymin = ymin
elif self.ymin is None:
try:
self.ymin = np.nanmin(self.Spectrum.data[xpixmin:xpixmax])*ypeakscale + 0.0
except TypeError:
# this is assumed to be a Masked Array error
self.ymin = self.Spectrum.data[xpixmin:xpixmax].min()*ypeakscale + 0.0
if ymax is not None: self.ymax = ymax
elif self.ymax is None:
try:
self.ymax=(np.nanmax(self.Spectrum.data[xpixmin:xpixmax])-self.ymin) * ypeakscale + self.ymin
except TypeError:
self.ymax=((self.Spectrum.data[xpixmin:xpixmax]).max()-self.ymin) * ypeakscale + self.ymin
self.ymin += self.offset
self.ymax += self.offset
self.axis.set_xlim(self.xmin,self.xmax)
self.axis.set_ylim(self.ymin,self.ymax)
def __init__(self,
filename=None,
filetype=None,
xarr=None,
data=None,
error=None,
header=None,
doplot=False,
maskdata=True,
plotkwargs={},
xarrkwargs={},
**kwargs):
"""
Create a Spectrum object.
Must either pass in a filename or ALL of xarr, data, and header, plus
optionally error.
kwargs are passed to the file reader
Parameters
----------
filename : string
The file to read the spectrum from. If data, xarr, and error are
specified, leave filename blank.
filetype : string
Specify the file type (only needed if it cannot be automatically
determined from the filename)
xarr : `units.SpectroscopicAxis` or `np.ndarray`
The X-axis of the data. If it is an np.ndarray, you must pass
`xarrkwargs` or a valid header if you want to use any of the unit
functionality.
data : `np.ndarray`
The data array (must have same length as xarr)
error : `np.ndarray`
The error array (must have same length as the data and xarr arrays)
header : `pyfits.Header` or dict
The header from which to read unit information. Needs to be a
`pyfits.Header` instance or another dictionary-like object with the
appropriate information
maskdata : boolean
turn the array into a masked array with all nan and inf values masked
doplot : boolean
Plot the spectrum after loading it?
plotkwargs : dict
keyword arguments to pass to the plotter
xarrkwargs : dict
keyword arguments to pass to the SpectroscopicAxis initialization
(can be used in place of a header)
Examples
--------
>>> sp = pyspeckit.Spectrum(data=np.random.randn(100),
xarr=np.linspace(-50, 50, 100), error=np.ones(100)*0.1,
xarrkwargs={'unit':'km/s', 'refX':4.829, 'refX_units':'GHz',
'xtype':'VLSR-RAD'}, header={})
>>> xarr = pyspeckit.units.SpectroscopicAxis(np.linspace(-50,50,100),
units='km/s', refX=6562.83, refX_units='angstroms')
>>> data = np.random.randn(100)*5 + np.random.rand(100)*100
>>> err = np.sqrt(data/5.)*5. # Poisson noise
>>> sp = pyspeckit.Spectrum(data=data, error=err, xarr=xarr, header={})
>>> # if you already have a simple fits file
>>> sp = pyspeckit.Spectrum('test.fits')
"""
if filename:
if filetype is None:
suffix = filename.rsplit('.', 1)[1]
if suffix in readers.suffix_types:
# use the default reader for that suffix
filetype = readers.suffix_types[suffix][0]
reader = readers.readers[filetype]
else:
raise TypeError("File with suffix %s is not recognized." %
suffix)
else:
if filetype in readers.readers:
reader = readers.readers[filetype]
else:
raise TypeError("Filetype %s not recognized" % filetype)
self.data, self.error, self.xarr, self.header = reader(
filename, **kwargs)
# these should probably be replaced with registerable function s...
if filetype in ('fits', 'tspec', 'pyfits', 'sdss'):
self.parse_header(self.header)
elif filetype is 'txt':
self.parse_text_header(self.header)
elif filetype in ('hdf5', 'h5'):
self.parse_hdf5_header(self.header)
if isinstance(filename, str):
self.fileprefix = filename.rsplit(
'.', 1)[0] # Everything prior to .fits or .txt
elif xarr is not None and data is not None:
# technically, this is unpythonic. But I don't want to search for all 10 attributes required.
if issubclass(type(xarr), units.SpectroscopicAxis):
self.xarr = xarr
else:
self.xarr = units.SpectroscopicAxis(xarr, **xarrkwargs)
self.data = data
if error is not None:
self.error = error
else:
self.error = data * 0
if hasattr(header, 'get'):
self.header = header
else: # set as blank
warn("WARNING: Blank header.")
self.header = pyfits.Header()
self.parse_header(self.header)
if maskdata:
if hasattr(self.data, 'mask'):
self.data.mask += np.isnan(self.data) + np.isinf(self.data)
self.error.mask += np.isnan(self.data) + np.isinf(self.data)
else:
self.data = np.ma.masked_where(
np.isnan(self.data) + np.isinf(self.data), self.data)
self.error = np.ma.masked_where(
np.isnan(self.data) + np.isinf(self.data), self.error)
self.plotter = plotters.Plotter(self)
self._register_fitters()
self.specfit = fitters.Specfit(self, Registry=self.Registry)
self.baseline = baseline.Baseline(self)
self.speclines = speclines
self._sort()
# Special. This needs to be modified to be more flexible; for now I need it to work for nh3
self.plot_special = None
self.plot_special_kwargs = {}
if doplot: self.plotter(**plotkwargs)
def lmfitter(self, xax, data, err=None, parinfo=None, quiet=True, debug=False, **kwargs):
"""
Use lmfit instead of mpfit to do the fitting
Parameters
----------
xax : SpectroscopicAxis
The X-axis of the spectrum
data : ndarray
The data to fit
err : ndarray (optional)
The error on the data. If unspecified, will be uniform unity
parinfo : ParinfoList
The guesses, parameter limits, etc. See
`pyspeckit.spectrum.parinfo` for details
quiet : bool
If false, print out some messages about the fitting
"""
try:
import lmfit
except ImportError as e:
raise ImportError( "Could not import lmfit, try using mpfit instead." )
self.xax = xax # the 'stored' xax is just a link to the original
if hasattr(xax,'convert_to_unit') and self.fitunits is not None:
# some models will depend on the input units. For these, pass in an X-axis in those units
# (gaussian, voigt, lorentz profiles should not depend on units. Ammonia, formaldehyde,
# H-alpha, etc. should)
xax = copy.copy(xax)
xax.convert_to_unit(self.fitunits, quiet=quiet)
elif self.fitunits is not None:
raise TypeError("X axis does not have a convert method")
if np.any(np.isnan(data)) or np.any(np.isinf(data)):
err[np.isnan(data) + np.isinf(data)] = np.inf
data[np.isnan(data) + np.isinf(data)] = 0
if parinfo is None:
parinfo, kwargs = self._make_parinfo(debug=debug, **kwargs)
if debug:
print parinfo
LMParams = parinfo.as_Parameters()
if debug:
print "LMParams: ","\n".join([repr(p) for p in LMParams.values()])
print "parinfo: ",parinfo
minimizer = lmfit.minimize(self.lmfitfun(xax,np.array(data),err,debug=debug),LMParams,**kwargs)
if not quiet:
print "There were %i function evaluations" % (minimizer.nfev)
#modelpars = [p.value for p in parinfo.values()]
#modelerrs = [p.stderr for p in parinfo.values() if p.stderr is not None else 0]
self.LMParams = LMParams
self.parinfo._from_Parameters(LMParams)
if debug:
print LMParams
print parinfo
self.mp = minimizer
self.mpp = self.parinfo.values
self.mpperr = self.parinfo.errors
self.mppnames = self.parinfo.names
modelkwargs = {}
modelkwargs.update(self.modelfunc_kwargs)
self.model = self.n_modelfunc(self.parinfo, **modelkwargs)(xax)
if hasattr(minimizer,'chisqr'):
chi2 = minimizer.chisqr
else:
try:
chi2 = (((data-self.model)/err)**2).sum()
except TypeError:
chi2 = ((data-self.model)**2).sum()
if np.isnan(chi2):
warn( "Warning: chi^2 is nan" )
if hasattr(self.mp,'ier') and self.mp.ier not in [1,2,3,4]:
print "Fitter failed: %s, %s" % (self.mp.message, self.mp.lmdif_message)
return self.mpp,self.model,self.mpperr,chi2
def make_axis(xarr,
hdr,
specname=None,
wcstype='',
specaxis="1",
verbose=True,
**kwargs):
"""
Parse parameters from a .fits header into required SpectroscopicAxis
parameters
"""
#DEBUG if wcstype is not '': print "Loading file with WCSTYPE %s" % wcstype
xunits = hdr.get('CUNIT%s%s' % (specaxis, wcstype))
if hdr.get('ORIGIN') == 'CLASS-Grenoble' and xunits is None:
# CLASS default
xunits = 'Hz'
# SDSS doesn't use FITS standard! Argh.
if hdr.get('TELESCOP') == 'SDSS 2.5-M':
xunits = 'angstroms'
# IRAF also doesn't use the same standard
if xunits is None:
if hdr.get('WAT1_001') is not None:
pairs = hdr.get('WAT1_001').split()
pdict = dict([s.split("=") for s in pairs])
if 'units' in pdict:
xunits = pdict['units']
if hdr.get('REFFREQ' + wcstype):
refX = hdr.get('REFFREQ' + wcstype)
elif hdr.get('RESTFREQ' + wcstype):
refX = hdr.get('RESTFREQ' + wcstype)
elif hdr.get('RESTFRQ' + wcstype):
refX = hdr.get('RESTFRQ' + wcstype)
else:
if verbose:
warn(
"Warning: No reference frequency found. Velocity transformations will not be possible unless you set a reference frequency/wavelength"
)
refX = None
if hdr.get('CTYPE%s%s' % (specaxis, wcstype)):
xtype = hdr.get('CTYPE%s%s' % (specaxis, wcstype))
else:
xtype = 'VLSR'
if hdr.get('VELDEF'):
convention, frame = units.parse_veldef(hdr['VELDEF'])
vframe = hdr.get('VFRAME') if hdr.get('VFRAME') is not None else 0.0
else:
convention, frame = None, None
vframe = 0.0
XAxis = units.SpectroscopicAxis(xarr,
xunits,
xtype=xtype,
refX=refX,
velocity_convention=convention,
frame=frame,
frame_offset=vframe,
**kwargs)
return XAxis
def open_1d_pyfits(pyfits_hdu, specnum=0, wcstype='', specaxis="1",
errspecnum=None, autofix=True, scale_keyword=None,
scale_action=operator.div, verbose=False, apnum=0, **kwargs):
"""
This is open_1d_fits but for a pyfits_hdu so you don't necessarily have to
open a fits file
"""
# force things that will be treated as strings to be strings
# this is primarily to avoid problems with variables being passed as unicode
wcstype = str(wcstype)
specaxis = str(specaxis)
hdr = pyfits_hdu._header
if autofix:
for card in hdr.cards:
try:
if verbose: card.verify('fix')
else: card.verify('silentfix')
except pyfits.VerifyError:
hdr.__delitem__(card.key)
data = pyfits_hdu.data
# search for the correct axis (may be 1 or 3, unlikely to be 2 or others)
# 1 = 1D spectrum
# 3 = "3D" spectrum with a single x,y point (e.g., JCMT smurf/makecube)
if hdr.get('NAXIS') > 1:
for ii in xrange(1,hdr.get('NAXIS')+1):
ctype = hdr.get('CTYPE%i'%ii)
if ctype in units.xtype_dict:
specaxis="%i" % ii
if hdr.get('NAXIS') == 2:
if hdr.get('WAT0_001') is not None:
if 'multispec' in hdr.get('WAT0_001'):
# treat as an Echelle spectrum from IRAF
warn("""
This looks like an Echelle spectrum. You may want to load it
using pyspeckit.wrappers.load_IRAF_multispec. The file will still
be successfully read if you continue, but the plotting and fitting packages
will run into errors.""")
return read_echelle(pyfits_hdu)
if isinstance(specnum,list):
# allow averaging of multiple spectra (this should be modified
# - each spectrum should be a Spectrum instance)
spec = ma.array(data[specnum,:]).mean(axis=0)
elif isinstance(specnum,int):
spec = ma.array(data[specnum,:]).squeeze()
else:
raise TypeError(
"Specnum is of wrong type (not a list of integers or an integer)." +
" Type: %s" %
str(type(specnum)))
if errspecnum is not None:
# SDSS supplies weights, not errors.
if hdr.get('TELESCOP') == 'SDSS 2.5-M':
errspec = 1. / np.sqrt(ma.array(data[errspecnum,:]).squeeze())
else:
errspec = ma.array(data[errspecnum,:]).squeeze()
else:
errspec = spec*0 # set error spectrum to zero if it's not in the data
elif hdr.get('NAXIS') > 2:
if hdr.get('BANDID2'):
# this is an IRAF .ms.fits file with a 'background' in the 3rd dimension
spec = ma.array(data[specnum,apnum,:]).squeeze()
else:
for ii in xrange(3,hdr.get('NAXIS')+1):
# only fail if extra axes have more than one row
if hdr.get('NAXIS%i' % ii) > 1:
raise ValueError("Too many axes for open_1d_fits")
spec = ma.array(data).squeeze()
if errspecnum is None:
errspec = spec*0 # set error spectrum to zero if it's not in the data
else:
spec = ma.array(data).squeeze()
if errspecnum is None: errspec = spec*0 # set error spectrum to zero if it's not in the data
if scale_keyword is not None:
try:
print "Found SCALE keyword %s. Using %s to scale it" % (scale_keyword,scale_action)
scaleval = hdr[scale_keyword]
spec = scale_action(spec,scaleval)
errspec = scale_action(errspec,scaleval)
except (ValueError, KeyError) as e:
pass
xarr = None
if hdr.get('ORIGIN') == 'CLASS-Grenoble':
# Use the CLASS FITS definition (which is non-standard)
# http://iram.fr/IRAMFR/GILDAS/doc/html/class-html/node84.html
# F(n) = RESTFREQ + CRVALi + ( n - CRPIXi ) * CDELTi
if verbose: print "Loading a CLASS .fits spectrum"
dv = -1*hdr.get('CDELT1')
if hdr.get('RESTFREQ'):
v0 = hdr.get('RESTFREQ') + hdr.get('CRVAL1')
elif hdr.get('RESTF'):
v0 = hdr.get('RESTF') + hdr.get('CRVAL1')
else:
warn("CLASS file does not have RESTF or RESTFREQ")
p3 = hdr.get('CRPIX1')
elif hdr.get(str('CD%s_%s%s' % (specaxis,specaxis,wcstype))):
dv = hdr['CD%s_%s%s' % (specaxis,specaxis,wcstype)]
v0 = hdr['CRVAL%s%s' % (specaxis,wcstype)]
p3 = hdr['CRPIX%s%s' % (specaxis,wcstype)]
hdr['CDELT%s' % specaxis] = dv
if verbose: print "Using the FITS CD matrix. PIX=%f VAL=%f DELT=%f" % (p3,v0,dv)
elif hdr.get(str('CDELT%s%s' % (specaxis,wcstype))):
dv = hdr['CDELT%s%s' % (specaxis,wcstype)]
v0 = hdr['CRVAL%s%s' % (specaxis,wcstype)]
p3 = hdr['CRPIX%s%s' % (specaxis,wcstype)]
if verbose: print "Using the FITS CDELT value. PIX=%f VAL=%f DELT=%f" % (p3,v0,dv)
elif len(data.shape) > 1:
if verbose: print "No CDELT or CD in header. Assuming 2D input with 1st line representing the spectral axis."
# try assuming first axis is X axis
if hdr.get('CUNIT%s%s' % (specaxis,wcstype)):
xarr = data[0,:]
spec = data[1,:]
if data.shape[0] > 2:
errspec = data[2,:]
else:
raise TypeError("Don't know what type of FITS file you've input; "+
"its header is not FITS compliant and it doesn't look like it "+
"was written by pyspeckit.")
# Deal with logarithmic wavelength binning if necessary
if xarr is None:
if hdr.get('WFITTYPE') == 'LOG-LINEAR':
xconv = lambda v: 10**((v-p3+1)*dv+v0)
xarr = xconv(np.arange(len(spec)))
else:
xconv = lambda v: ((v-p3+1)*dv+v0)
xarr = xconv(np.arange(len(spec)))
# need to do something with this...
restfreq = hdr.get('RESTFREQ')
if restfreq is None: restfreq= hdr.get('RESTFRQ')
XAxis = make_axis(xarr,hdr,wcstype=wcstype,specaxis=specaxis,**kwargs)
return spec,errspec,XAxis,hdr
def units(self, value):
warn("'units' is deprecated; please use 'unit'")
self._unit = value
