Fetch a particular interval from a double precision window. 

   WINDOWS 

   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   window     I   Input window. 
   n          I   Index of interval to be fetched. 
   left, 
   right      O   Left, right endpoints of the nth interval. 

   window      is a window containing zero or more intervals. 

               window must be declared as a double precision SpiceCell.

   n           is the index of a particular interval within the 
               window.  Indices range from 0 to N-1, where N is the
               number of intervals in the window.

   left, 
   right       are the left and right endpoints of the nth interval 
               in the input window.   

   None. 

   None. 

   Let window contain the intervals 

      [ 1, 3 ]  [ 7, 11 ]  [ 23, 27 ] 

   Then the following calls 

      wnfetd_c ( &window, -1, &left, &right );    (1) 
      wnfetd_c ( &window,  1, &left, &right );    (2) 
      wnfetd_c ( &window,  5, &left, &right );    (3) 

   yield the following values of left and right 

      left         right 
      ---------    --------- 
      Undefined    Undefined 
      7            11 
      Undefined    Undefined 

   None. 

   1) If the input window does not have double precision type,
      the error SPICE(TYPEMISMATCH) is signaled.

   2) If n is less than zero, the error SPICE(NOINTERVAL) is 
      signaled. 

   3) If the interval does not exist, ie., n is greater than the
      number of intervals in the window, the error SPICE(NOINTERVAL) 
      is signaled. 

   None. 

   N.J. Bachman    (JPL)
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 

   None. 

   -CSPICE Version 1.0.0, 22-AUG-2002 (NJB) (WLT) (IMU)

   fetch an interval from a d.p. window