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Required Reading


   CSPICE_CKOBJ returns the set of ID codes of all objects in a
   specified CK file.



      ck      the name(s) for SPICE CKs .

              [1,c1] = size(ck), char = class(ck)


              [m,c2] = size(ck), char = class(ck)


              [1,m] = size(ck), cell = class(ck)

      room    the maximum number of CK IDs to return from 'ck'.

              [1,1] = size(room), int32 = class(room)

      ids_i   an optional input describing an array of CK ID
              codes. Inclusion of this array results in an output
              array consisting of a union of the data retrieved from
              the 'ck' kernels and the data in 'ids_i'.

              [n,1] = size(ids_i), int32 = class(ids_i)


              [0,0] = size(ids_i), int32 = class(ids_i)

   the call:

      ids = cspice_ckobj( ck, room, ids_i)


      ids = cspice_ckobj( ck, room)


      ids   the set of unique CK ID codes for which pointing data exists
            in 'ck'. If 'ids_i' exists in the argument list, 'ids' returns 
            as a union of the coverage data found in 'ck' and the data in
            'ids_i'. 'ids' can overwrite 'ids_i'.

            [p,1] = size(ids), int32 = class(ids)


   Any numerical results shown for this example may differ between
   platforms as the results depend on the SPICE kernels used as input
   and the machine specific arithmetic implementation.

   Use a simple function to display the CK IDs found in a CK, or set of
   CKs, and the time coverage of the data corresponding to those IDs.
   This example calls both cspice_ckobj and cspice_ckcov. In practice,
   algorithms using cspice_ckobj will also use cspice_ckcov and

   function ckcov_t( CK, SCLK, LEVEL )

         MAXIV  = 100000;
         WINSIZ = 2 * MAXIV;
         MAXOBJ = 1000;
         LSK    = 'naif0010.tls';

         % Load a leapseconds kernel and the SCLK corresponding to the
         % input CK.
         % Note, neither cspice_ckcov or cspice_ckobj require these
         % kernels to function. We need these data for output time
         % conversion.
         cspice_furnsh( LSK )
         cspice_furnsh( SCLK)

         % Find the set of objects in the CK file.
         ids = cspice_ckobj( CK, MAXOBJ );

         % We want to display the coverage for each object. Loop over
         % the contents of the ID code set, find the coverage for
         % each item in the set, and display the coverage.
         for i=1:numel(ids)

            % Extract the coverage data for object 'ids(i)'.
            cover    = cspice_ckcov(CK, ids(i), 0, LEVEL, 0.0, 'TDB', WINSIZ);
            [row,col]= size(cover);

            % Display a simple banner.
            fprintf( '========================================\n')
            fprintf( 'Coverage for object %d\n', ids(i) )

            %  'cover' has dimension 2Nx1, where 'row' has the value 2N with
            %  each window defined as a pair of endpoints such that:
            %  window 1 = cover(1:2)
            %  window 2 = cover(3:4)
            %  window 3 = cover(5:6)
            %        ...
            %  window N = cover(2N-1,2N)
            % Loop from 1 to 'row' with stepsize 2.
            for j=1:2:row

               % Convert the endpoints to TDB calendar format time strings
               % and display them. Pass the endpoints in an array,
               % so cspice_timout returns an array of time strings.
               % Recall a vectorized input has dimension 1xM so transpose
               % the 'cover' slice.
               timstr = cspice_timout( cover(j:j+1)', ...
                                   'YYYY MON DD HR:MN:SC.### (TDB) ::TDB' );
               fprintf('Interval: %d\n'  , (j+1)/2 )
               fprintf('   Start: %s\n'  , timstr(1,:) )
               fprintf('    Stop: %s\n\n', timstr(2,:) )



         % Empty the kernel pool.

   Example (1):

      Assign a CK kernel list as and SCLK:

      >> SCLK = '/kernels/cassini/sclk/cas00101.tsc';
      >> CK   = { '/kernels/cassini/ck/05357_05362ra.bc', ...
                  '/kernels/cassini/ck/05362_06002ra.bc'   };

      Output data using the 'INTERVAL' level.

      >> ckcov_t( CK, SCLK, 'INTERVAL' )

   MATLAB outputs:

      Coverage for object -82000
      Interval: 1
         Start: 2005 DEC 23 00:01:07.900 (TDB)
          Stop: 2005 DEC 23 15:36:55.540 (TDB)

      Interval: 2
         Start: 2005 DEC 23 15:37:39.539 (TDB)
          Stop: 2005 DEC 23 16:59:35.508 (TDB)

      Interval: 3
         Start: 2005 DEC 23 17:00:43.507 (TDB)
          Stop: 2005 DEC 24 13:55:59.025 (TDB)

      Interval: 4
         Start: 2005 DEC 24 13:56:19.024 (TDB)
          Stop: 2005 DEC 24 17:25:42.944 (TDB)

                ... continued ...

      Interval: 24
         Start: 2005 DEC 31 15:49:11.103 (TDB)
          Stop: 2006 JAN 01 15:18:34.561 (TDB)

      Interval: 25
         Start: 2006 JAN 01 15:20:30.560 (TDB)
          Stop: 2006 JAN 01 16:43:38.528 (TDB)

      Interval: 26
         Start: 2006 JAN 01 16:45:02.528 (TDB)
          Stop: 2006 JAN 01 22:52:10.386 (TDB)

      Interval: 27
         Start: 2006 JAN 01 22:52:38.386 (TDB)
          Stop: 2006 JAN 02 00:01:02.360 (TDB)

   Example (2):

      Output data using the 'SEGMENT' level.

      >> ckcov_t( CK, SCLK, 'SEGMENT' )

   MATLAB outputs:

      Coverage for object -82000
      Interval: 1
         Start: 2005 DEC 23 00:01:07.900 (TDB)
          Stop: 2005 DEC 28 00:01:01.130 (TDB)

      Interval: 2
         Start: 2005 DEC 28 00:01:05.130 (TDB)
          Stop: 2006 JAN 02 00:01:02.360 (TDB)



Required Reading

   For important details concerning this module's function, please refer to
   the CSPICE routine ckobj_c.



   -Mice Version 1.3.0, 03-APR-2012, EDW (JPL)

      Edits to Example code and comments. No change to Example code

      Added error check on 'ids_i' to ensure the argument either has
      shape [N,1] or is an empty array with shape [0,0].

      Renamed the argument 'size' to 'room'. "size" is a Matlab function
      name and it's seriously dumb to use a function name word as an argument

      Edited I/O section to conform to NAIF standard for Mice documentation.

      Explicitly described ID variables as "CK IDs."

   -Mice Version 1.2.0, 13-AUG-2009, EDW (JPL)

      The union of 'ids_i'  with the interface return argument 'ids'
      again calculated using the "unique" function, replacing "union."
      This implementation results in the expected behavior of the
      call in octave when 'ids_i' contains zero or one element.

      Corrected typo in previous Version entry.

   -Mice Version 1.1.0, 29-DEC-2008, EDW (JPL)

      Corrected error in comment description for 'ids_i'.
      Removed the line:

         Note: 'ids_i' cannot be an empty array.

      The argument can have the empty array value, [], on

      Corrected several typos.

      'ids_i' union with interface return call now calculated
      using the 'union' function instead of 'unique'.

   -Mice Version 1.0.0, 19-JUN-2007, EDW (JPL)


   find ID codes in ck file

Wed Apr  5 18:00:30 2017