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Table ignores FITS fill value

See original GitHub issue

Is this a bug or a feature?

>>> import astropy
>>> from astropy.io import fits
>>> from astropy.table import Table
>>> astropy.__version__
'1.3.dev16038'
>>> with fits.open('mytable.fits') as pf:
...     hdr = pf[1].header
...     dat = pf[1].data
...     tab = Table.read(pf[1], format='fits')
>>> hdr
XTENSION= 'BINTABLE'           / binary table extension                         
BITPIX  =                    8 / array data type                                
NAXIS   =                    2 / number of array dimensions                     
NAXIS1  =                   12 / length of dimension 1                          
NAXIS2  =                    2 / length of dimension 2                          
PCOUNT  =                    0 / number of group parameters                     
GCOUNT  =                    1 / number of groups                               
TFIELDS =                    2 / number of table fields                         
TTYPE1  = 'a       '                                                            
TFORM1  = 'J       '                                                            
TTYPE2  = 'b       '                                                            
TFORM2  = 'K       '                                                            
TUNIT1  = 'm       '                                                            
TNULL1  =               999999                                                  
TUNIT2  = 's       '                                                            
TNULL2  =               999999                    
>>> dat  # Has fill value
FITS_rec([(1, 3), (999999, 4)], 
      dtype=(numpy.record, [('a', '>i4'), ('b', '>i8')]))
>>> tab  # No fill value
<Table masked=True length=2>
  a     b  
  m     s  
int32 int64
----- -----
    1     3
   --     4

Issue Analytics

State:
Created 7 years ago
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

pllimcommented, May 15, 2018

I haven’t complained since 2016, so I will just close this. I think from the answers, it is pretty clear that this is a feature and not a bug. 😄

0reactions

saimncommented, May 15, 2018

@pllim - With the other fill_value/TNULL issues, I found this one. The behavior seems correct to me, what do you mean by “why it is not filled by default” ? The read table is masked, so the masked value is hidden but it’s value is 999999.

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