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 8vector.
;;
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.REQ
CELLS.REQ
WINDOWS.REQ
Icy Version 1.0.2, 26NOV2007, EDW (JPL)
Implemented use of cspice_wncard function to return
window cardinality.
Icy Version 1.0.1, 12SEP2006, EDW (JPL)
Correct Required Reading citation CELL.REQ to CELLS.REQ.
Icy Version 1.0.0, 08AUG2004, EDW (JPL)
filter small intervals from a d.p. window
