CSPICE_WNFLTD filters (removes) small intervals from a double precision window.. For important details concerning this module's function, please refer to the CSPICE routine wnfltd_c.
Given: small the scalar double precision limiting measure of the small intervals to filter. Intervals of measure less than or equal to 'small' are removed from the window. window a scalar, double precision window containing zero or more intervals. 'window' must be created as a window structure via a cspice_celld call. the call: cspice_wnfltd, small, window returns: window on output, is the original window, after 'small' intervals have been removed.
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 a cell containing a double ;; precision 8-vector. ;; win1 = cspice_celld( 8 ) ;; ;; Define a window with four intervals. ;; darray = [ [ 1.d, 3.0], [ 7.0, 11.0], [23.0, 27.0], [29.d, 29.d] ] ;; ;; Add the window data to the cell. ;; for i=0, 3 do begin cspice_wninsd, darray[0,i], darray[1,i], win1 endfor ;; ;; Filter the gaps: ;; cspice_wnfltd, 3.d0, win1 ;; ;; Calculate the number of intervals in the ;; return window 'win1'. ;; no_intervals = cspice_wncard(win1) ;; ;; Output the intervals. ;; for i= 0, (no_intervals -1 ) do begin cspice_wnfetd, win1, i, left, right print, left, right endfor IDL outputs: 7.0000000 11.000000 23.000000 27.000000
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)
filter small intervals from a d.p. window
Wed Apr 5 17:58:05 2017