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- ipython --pylab
- Python 3.6.0 |Anaconda custom (x86_64)| (default, Dec 23 2016, 13:19:00)
- Type "copyright", "credits" or "license" for more information.
- IPython 5.1.0 -- An enhanced Interactive Python.
- ? -> Introduction and overview of IPython's features.
- %quickref -> Quick reference.
- help -> Python's own help system.
- object? -> Details about 'object', use 'object??' for extra details.
- Using matplotlib backend: MacOSX
- In [1]: import specutils
- INFO:root:Successfully loaded reader "cubetest1".
- INFO:root:Successfully loaded reader "tabular-fits".
- INFO:root:Successfully loaded reader "wcs1d-fits".
- In [3]: s1d = specutils.wcs_fits_reader.wcs1d_fits('test_L1455IRS1_DCN2-1.fits')
- INFO:root:Spectrum file looks like wcs1d-fits
- WARNING: Header block contains null bytes instead of spaces for padding, and is not FITS-compliant. Nulls may be replaced with spaces upon writing. [astropy.io.fits.header]
- WARNING:astropy:Header block contains null bytes instead of spaces for padding, and is not FITS-compliant. Nulls may be replaced with spaces upon writing.
- WARNING: FITSFixedWarning: 'celfix' made the change 'Linear transformation matrix is singular'. [astropy.wcs.wcs]
- WARNING:astropy:FITSFixedWarning: 'celfix' made the change 'Linear transformation matrix is singular'.
- ---------------------------------------------------------------------------
- SingularMatrixError Traceback (most recent call last)
- <ipython-input-3-165e2b31c6c4> in <module>()
- ----> 1 s1d = specutils.wcs_fits_reader.wcs1d_fits('test_L1455IRS1_DCN2-1.fits')
- 2
- /Users/tsrice/anaconda3/lib/python3.6/site-packages/specutils-0.1.dev727-py3.6.egg/specutils/io/registers.py in wrapper(*args, **kwargs)
- 32 @wraps(func)
- 33 def wrapper(*args, **kwargs):
- ---> 34 return func(*args, **kwargs)
- 35 return wrapper
- 36 return decorator
- /Users/tsrice/anaconda3/lib/python3.6/site-packages/specutils-0.1.dev727-py3.6.egg/specutils/io/default_loaders/wcs_fits_reader.py in wcs1d_fits(file_name, spectral_axis_unit, **kwargs)
- 37 with fits.open(file_name, **kwargs) as hdulist:
- 38 header = hdulist[0].header
- ---> 39 wcs = WCS(header)
- 40
- 41 if 'BUNIT' in header:
- /Users/tsrice/anaconda3/lib/python3.6/site-packages/astropy/wcs/wcs.py in __init__(self, header, fobj, key, minerr, relax, naxis, keysel, colsel, fix, translate_units, _do_set)
- 501
- 502 if _do_set:
- --> 503 self.wcs.set()
- 504
- 505 for fd in close_fds:
- SingularMatrixError: ERROR 3 in wcsset() at line 2213 of file cextern/wcslib/C/wcs.c:
- Linear transformation matrix is singular.
- ERROR 3 in linset() at line 607 of file cextern/wcslib/C/lin.c:
- PCi_ja matrix is singular.
- In [5]: from astropy.io.fits import getdata
- In [6]: data, header = getdata("test_L1455IRS1_DCN2-1.fits", header=True)
- WARNING: Header block contains null bytes instead of spaces for padding, and is not FITS-compliant. Nulls may be replaced with spaces upon writing. [astropy.io.fits.header]
- WARNING:astropy:Header block contains null bytes instead of spaces for padding, and is not FITS-compliant. Nulls may be replaced with spaces upon writing.
- In [10]: data
- Out[10]:
- array([[[[-0.00654329, 0.01778164, -0.01153884, ..., -0.01729367,
- 0.01069437, -0.01851475]]]])
- In [11]: data.shape
- Out[11]: (1, 1, 1, 37275)
- In [7]: header
- Out[7]:
- SIMPLE = T /
- BITPIX = -64
- NAXIS = 4 /
- NAXIS1 = 37275 /
- NAXIS2 = 1 /
- NAXIS3 = 1 /
- NAXIS4 = 1 /
- BLOCKED = T /
- DATAMIN = -0.146224617958E+000 /
- DATAMAX = 0.140489089489E+001 /
- BUNIT = 'K ' /
- CTYPE1 = 'FREQ ' /
- CRVAL1 = 0.000000000000E+000 / Offset frequency
- CDELT1 = 0.488281250000E+005 / Frequency resolution
- CRPIX1 = 0.176140019531E+005 /
- CTYPE2 = 'RA---GLS' /
- EQUINOX = 0.200000000000E+004 /
- CRVAL2 = 0.519129166667E+002 /
- CDELT2 = 0.000000000000E+000 /
- CRPIX2 = 0.000000000000E+000 /
- CTYPE3 = 'DEC--GLS' /
- CRVAL3 = 0.302175000000E+002 /
- CDELT3 = 0.000000000000E+000 /
- CRPIX3 = 0.000000000000E+000 /
- CTYPE4 = 'STOKES ' /
- CRVAL4 = 1.0000000000000 /
- CDELT4 = 0.0000000000000 /
- CRPIX4 = 0.0000000000000 /
- TELESCOP= '30ME1-LI-F0-' /
- OBJECT = 'L1455IRS1 ' /
- LINE = 'DCN(2-1) ' / Line name
- RESTFREQ= 0.144828001000E+012 / Rest frequency
- VELO-LSR= 0.500000000000E+004 / Velocity of reference channel
- DELTAV = -0.101073712111E+003 / Velocity spacing of channels
- IMAGFREQ= 0.157326768103E+012 / Image frequency
- TSYS = 0.845444717407E+002 / System temperature
- OBSTIME = 0.165860595703E+004 / Integration time
- SCAN-NUM= 0.100000000000E+001 / Scan number
- TAU-ATM = 0.288365986198E-001 / Atmospheric opacity
- NPHASE = 1 / Number of frequency phases
- DELTAF1 = 0.000000000000E+000 / Frequency offset Phase 1
- PTIME1 = 0.498978763819E+000 / Duration of Phase 1
- WEIGHT1 = 0.000000000000E+000 / Weight of Phase 1
- GAINIMAG= 0.501190014184E-001 / Image sideband gain ratio
- BEAMEFF = 0.930000007153E+000 / Beam efficiency
- FORWEFF = 0.930000007153E+000 / Image sideband gain ratio
- ORIGIN = 'CLASS-Grenoble ' /
- DATE = '2017-09-21T00:00:00.000' / Date written
- TIMESYS = 'UTC ' /
- DATE-OBS= '2014-12-26T18:48:39.588' / Date observed
- DATE-RED= '2017-09-21T00:00:00.000' / Date reduced
- ELEVATIO= 0.592332514636E+002 / Telescope elevation
- AZIMUTH = 0.000000000000E+000 / Telescope azimuth
- UT = ' 18:48:39.588' / Universal time at start
- LST = ' 00:55:48.714' / Sideral time at start
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