[AstroPy] Query about Table.add_row() method for masked tables

[Thomas Robitaille]

Hi Josh,

The following should work:

    In [8]: t = Table([[1], [2]], names=('a','b'), masked=True)

    In [9]: t.add_row({})

    In [10]: t
    Out[10]:
    <Table masked=True length=2>
      a     b
    int64 int64
    ----- -----
        1     2
       --    --

Is this what you need?

Cheers,
Tom


Erik Bray wrote:
> On 10/1/2015 4:30 PM, Josh Tan wrote:
>> Hello,
>>
>> I have been trying to use astropy tables and have found that you
>> cannot add a
>> `None` row with a mask. While I can go and add np.zeroes by hand, it’s
>> a bit
>> annoying to me that it behaves this way. (See examples below.)
> 
> Hi Josh,
> 
> There definitely seems to be some conflict between add_row(None) and
> add_row(..., mask=...).  It seems to be that the allowed formats for the
> mask value aren't really compatible with the add_row(None) syntax.  I
> think that could be fixed--the way you were trying to do it,
> add_row(None, mask=True), makes sense to me.
> 
> Erik
> 
>> In [69]:
>>
>> t  =Table([[1], [2]],names=('a','b'),masked=True)
>>
>> t.add_row(None,mask=True)
>>
>> ---------------------------------------------------------------------------
>>
>> TypeError                                  Traceback (most recent call
>> last)
>> <ipython-input-69-4b6f404ff930>  in<module>() 1 t=  Table([[1], 
>> [2]],  names=('a',  'b'),  masked=True)
>> ----> 2t.add_row(None,  mask=True)
>>
>> /Users/joshuaschroeder/Documents/Ureka/python/lib/python2.7/site-packages/astropy/table/table.pyc 
>> inadd_row(self, vals, mask) 1623 3 6 9
>> 1624          """
>> -> 1625self.insert_row(len(self),  vals,  mask)
>> 1626
>> 1627      def  insert_row(self,  index,  vals=None,  mask=None):
>>
>> /Users/joshuaschroeder/Documents/Ureka/python/lib/python2.7/site-packages/astropy/table/table.pyc 
>> ininsert_row(self, index, vals, mask) 1674 # that have entries for
>> each table column.
>> 1675              if  maskis  not  Noneand  not  _is_mapping(mask):
>> -> 1676raise TypeError("Mismatch between type of vals and mask")
>> 1677
>> 1678              # Now check that the mask is specified for the same
>> keys as the
>>
>> TypeError: Mismatch between type of vals and mask
>>
>>
>> In [74]:
>>
>> t  =Table([[1], [2]],names=('a','b'),masked=True)
>>
>> t.add_row(None,mask=len(t.colnames)*[True])
>>
>> ---------------------------------------------------------------------------
>>
>> TypeError                                  Traceback (most recent call
>> last)
>> <ipython-input-74-ae9160dbf05d>  in<module>() 1 t=  Table([[1], 
>> [2]],  names=('a',  'b'),  masked=True)
>> ----> 2t.add_row(None,  mask=len(t.colnames)*[True])
>>
>> /Users/joshuaschroeder/Documents/Ureka/python/lib/python2.7/site-packages/astropy/table/table.pyc 
>> inadd_row(self, vals, mask) 1623 3 6 9
>> 1624          """
>> -> 1625self.insert_row(len(self),  vals,  mask)
>> 1626
>> 1627      def  insert_row(self,  index,  vals=None,  mask=None):
>>
>> /Users/joshuaschroeder/Documents/Ureka/python/lib/python2.7/site-packages/astropy/table/table.pyc 
>> ininsert_row(self, index, vals, mask) 1674 # that have entries for
>> each table column.
>> 1675              if  maskis  not  Noneand  not  _is_mapping(mask):
>> -> 1676raise TypeError("Mismatch between type of vals and mask")
>> 1677
>> 1678              # Now check that the mask is specified for the same
>> keys as the
>>
>> TypeError: Mismatch between type of vals and mask
>>
>>
>>
>>
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>>
> 
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