Index Page
A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X 

Required Reading


   CSPICE_SPKW08 writes a type 8 segment to an SPK file.



      handle   the file handle of an SPK file open for writing.

               [1,1] = size(handle); int32 = class(handle)

      body     the SPICE ID code for an ephemeris object
               whose state relative to another body is described
               by the segment to be created.

               [1,1] = size(body); int32 = class(body)

      center   the SPICE ID code for the center of motion
               of the object identified by body.

               [1,1] = size(center); int32 = class(center)

      frame    the name for a reference frame relative to which the state
               information for body is specified.

               [1,c1] = size(fname); char = class(fname)


               [1,1] = size(fname); cell = class(fname)

      last     are, respectively, the start and stop times of
               the time interval over which the segment defines
               the state of body.

               [1,1] = size(first); double = class(first)
               [1,1] = size(last);  double = class(last)

      segid    is the segment identifier.  An SPK segment
               identifier may contain up to 40 characters.

      degree   the degree of the Lagrange polynomials used to
               interpolate the states.  All components of the
               state vectors are interpolated by polynomials of
               fixed degree.

               [1,1] = size(degree); int32 = class(degree)

      states   contains a time-ordered array of geometric states
               ( x, y, z, dx/dt, dy/dt, dz/dt, in kilometers and
               kilometers per second ) of body relative to center,
               specified relative to frame.

               [6,m] = size(states); double = class(states)

      epoch1   the epoch corresponding to the first state in
               the state array.  Because extra states are needed
               at the beginning and end of the segment in order
               for the interpolation method to work, epoch1 will
               normally precede first.

               [1,1] = size(epoch1); double = class(epoch1)

      step     the time step separating the epochs of adjacent
               states in the input state array.  step is specified
               in TDB seconds.

               [1,1] = size(step); double = class(step)

   the call:

      cspice_spkw08( handle, body,  center, frame,  first,  ...
                     last,   segid, degree, states, epoch1, ...
                     step )


   The routine writes to the SPK file referred to by 'handle' a type 8 SPK
   segment containing the data listed in 'states'.


   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.


      % Define the segment identifier parameters.
      BODY       = 3;
      CENTER     = 10;
      REF        = 'J2000';
      POLY_DEG   = 3;
      SPK8       = 'test8.bsp';
      N_DISCRETE = 9;

      % A set of epochs.
      DISCRETEEPOCHS = (1:9)*100;

      % An array of discrete states to write to the SPK segment.
      base = [ (1:6)*100 ]';

      % Create the 6xN array of states.
      DISCRETESTATES = [(base+1), (base+2), (base+3), ...
                        (base+4), (base+5), (base+6), ...
                        (base+7), (base+8), (base+9) ];

      % Create a segment identifier.
      segid = 'SPK type 8 test segment';

      % Open a new SPK file. Delete if a file of the same name exists.
      if ( exist( SPK8, 'file' ) == 2 )
         delete( SPK8 )

      handle = cspice_spkopn( SPK8, segid, 4 );


      % Create a type 8 segment.
      cspice_spkw08( handle,                       ...
                     BODY,                         ...
                     CENTER,                       ...
                     REF,                          ...
                     DISCRETEEPOCHS(1),            ...
                     DISCRETEEPOCHS(N_DISCRETE),   ...
                     segid,                        ...
                     POLY_DEG,                     ...
                     DISCRETESTATES,               ...
                     DISCRETEEPOCHS(1),            ...
                     step )

      % Close the SPK file.
      cspice_spkcls( handle )

   MATLAB outputs:

      SPK file "test8.bsp" created containing a single type 8 segment.



Required Reading

   For important details concerning this module's function, please refer to
   the CSPICE routine spkw08_c.


   -Mice Version 1.0.0, 23-MAY-2012, EDW (JPL)


   write spk type_8 ephemeris data segment

Wed Apr  5 18:00:35 2017