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.
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'.
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
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.
-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)
complement a d.p. window
Wed Apr 5 17:58:04 2017