[task #16192] Add the possibility of read/write vectors

[Raul Infante-Sainz]

Follow-up Comment #2, task #16192 (project gnuastro):

Thanks a lot Mohammad. This is the best way I found to make it easy to play
with: just a small Python code to generate two tables. It only needs Astropy
and will generate two fits tables. 

- table-simple.fits: table containing 3 rows and 3 columns, single values.

- table-vector.fits: table containing 3 rows and 3 columns. The second column
is a vector with three elements (named as VECTOR).

I think the code is self-explanatory:


from astropy.table import Table


# Simple table with no multi-value column.
data_simple = [('row1', 1, 1),
               ('row2', 2, 2),
               ('row3', 3, 3)]

t_simple = Table(rows=data_simple, names=('A', 'B', 'C'))
t_simple.write('table-simple.fits', format='fits', overwrite=True)


# Vector-column table. Last column has multiple values (vector).
data_vector = [('row1', (11,12,13), 1),
               ('row2', (21,22,23), 1),
               ('row3', (31,32,33), 3)]

t_vector = Table(rows=data_vector, names=('A', 'VECTOR', 'C'))
t_vector.write('table-vector.fits', format='fits', overwrite=True)
 

Just save these lines as 'table.py', execute it and then open with Topcat. You
will see how they look like.



$ python3 table.py
$ astscript-fits-view table-simple.fits table-vector.fits



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