[gnuastro-devel] [task #14761] Selecting output columns from both matched inputs

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/task/?14761>

                 Summary: Selecting output columns from both matched inputs
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 04 Dec 2017 12:13:43 AM CET
         Should Start On: Mon 04 Dec 2017 12:00:00 AM CET
   Should be Finished on: Mon 04 Dec 2017 12:00:00 AM CET
                Category: Match
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

With an option like `--outcols', we can add a feaature to let the user specify
which of the columns from the two inputs they want in the output. When this
option is used, instead of two output tables that have their rows matched, we
can output one table with the requested columns from both inputs.

Here is one example of what I have in mind now (please share your suggestions
and improvements):


$ astmatch in1.fits in2.fits
--outcols=a1,aRA,aDEC,aMAG,bMAG,aMAG_ERR,bMAG_ERR


The first character in each output column is either an `a' or `b'. `a' means a
column in the first input and `b' means a column in the second input. After
that first character, the general Gnuastro column selection rules
<https://www.gnu.org/software/gnuastro/manual/html_node/Selecting-table-columns.html>
can be used to specify the column.

So in the example above, the output will be a single table with 7 columns (no
matter how many columns the two inputs had). The first four columns and its
column 6 will come from the respective columns in the first input and the 5th
and 7th column will come from the second input table.




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