[gnuastro-devel] [task #14146] Select pixels that are blank

[Mohammad Akhlaghi]

Update of task #14146 (project gnuastro):

                  Status:               Postponed => Done                   
        Percent Complete:                      0% => 100%                   
             Assigned to:                    None => makhlaghi              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

This task has been completed and is pushed
<http://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=8df52c61e2> to the
main repo.

The `blank' operand that was suggested in the first comment was not the
solution. Because it would violate the definition of a NaN: a NaN value must
not be equal to anything, even itself. 

Instead to complete this task, a much more cleaner and correct way was chosen:
to define a `isblank' operator (based on C's `isnan' function). This
operator's only job is to return the output of the `isnan' function on each
pixel or number that it pops out.

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  <http://savannah.gnu.org/task/?14146>

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