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Abstract
I/O
Examples
Particulars
Required Reading
Version
Index_Entries

Abstract


   CSPICE_WNCOMD determines the complement of a double 
   precision window with respect to a specified interval.

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

I/O

   
   Given:

      left, 
      right    the scalar, double precision left and right 
               endpoints of the complement interval.
   
      window   the scalar window to be complemented.  
               'window' must be created as a window structure
               via a cspice_celld call. 

   the call:

      cspice_wncomd, left, right, window, result

   returns:

      result   the scalar output window, containing the complement 
               of 'window' with respect to the interval from 'left' 
               to 'right'. If 'result' is not large enough 
               to contain the result, as many intervals as will 
               fit are returned. 

               The user must create 'result' using cspice_celld.

               'result' must be distinct from 'window'. 

Examples


   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.

      ;; 
      ;; Create two cells each containing a double
      ;; precision 8-vector.
      ;;
      win1 = cspice_celld( 8 )
      win2 = cspice_celld( 8 )

      ;;
      ;; Define a window with three intervals.
      ;;
      darray = [ [ 1.d, 3.0], [ 7.0, 11.0], [23.0, 27.0] ]

      ;;
      ;; Add the window data to the cell.
      ;;
      for i=0,2 do begin

         cspice_wninsd, darray[0,i], darray[1,i], win1

      endfor

      ;;
      ;; Do the complement.
      ;;
      left  = 2.d
      right = 20.d
   
      cspice_wncomd, 2.d0, 20.d0, win1, win2

      ;;
      ;; Calculate the number of intervals in the
      ;; return window 'win2'.
      ;;
      no_intervals = cspice_wncard(win2)

      ;;
      ;; Output the intervals.
      ;;
      for i= 0, (no_intervals -1 ) do begin

         cspice_wnfetd, win2, i, left, right
         print, left, right

      endfor

   IDL outputs:

      3.0000000       7.0000000
      11.000000       20.000000

Particulars


   The user must create any needed window structures with
   cspice_celld prior to use regardless of whether the routine
   uses the window as input or returns it as output.

Required Reading


   ICY.REQ
   CELLS.REQ
   WINDOWS.REQ

Version


   -Icy Version 1.0.2, 26-NOV-2007, EDW (JPL)

      Implemented use of cspice_wncard function to return 
      window cardinality.

   -Icy Version 1.0.1, 12-SEP-2006, EDW (JPL)

      Correct Required Reading citation CELL.REQ to CELLS.REQ.

   -Icy Version 1.0.0, 08-AUG-2004, EDW (JPL)

Index_Entries

 
   complement a d.p. window 
 



Wed Apr  5 17:58:04 2017