Index Page spkw08_c
A B C D E F G H I J K L M N O P Q R S T U V W X
Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries
#### Procedure
       void spkw08_c ( SpiceInt            handle,
                       SpiceInt            body,
                       SpiceInt            center,
                       ConstSpiceChar    * frame,
                       SpiceDouble         first,
                       SpiceDouble         last,
                       ConstSpiceChar    * segid,
                       SpiceInt            degree,
                       SpiceInt            n,
                       ConstSpiceDouble    states[][6],
                       SpiceDouble         epoch1,
                       SpiceDouble         step           )
#### Abstract
       Write a type 8 segment to an SPK file.
#### Required_Reading
       NAIF_IDS
       SPC
       SPK
       TIME
#### Keywords
       EPHEMERIS
       FILES
#### Brief_I/O
       Variable  I/O  Description
       --------  ---  --------------------------------------------------
       handle     I   Handle of an SPK file open for writing.
       body       I   NAIF code for an ephemeris object.
       center     I   NAIF code for center of motion of BODY.
       frame      I   Reference frame name.
       first      I   Start time of interval covered by segment.
       last       I   End time of interval covered by segment.
       segid      I   Segment identifier.
       degree     I   Degree of interpolating polynomials.
       n          I   Number of states.
       states     I   Array of states.
       epoch1     I   Epoch of first state in states array.
       step       I   Time step separating epochs of states.
       MAXDEG     P   Maximum allowed degree of interpolating polynomial.
#### Detailed_Input
       handle         is the file handle of an SPK file that has been
                      opened for writing.

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

       center         is the NAIF integer code for the center of motion
                      of the object identified by body.

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

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

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

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

       n              is the number of states in the input state vector
                      array.

       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.

       epoch1         is 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.

       step           is the time step separating the epochs of adjacent
                      states in the input state array.  step is specified
                      in seconds.
#### Detailed_Output
       None.  See $Particulars for a description of the effect of this
       routine.
#### Parameters
       MAXDEG         is the maximum allowed degree of the interpolating
                      polynomial.  If the value of MAXDEG is increased,
                      the CSPICE routine SPKPV must be changed
                      accordingly.  In particular, the size of the
                      record passed to SPKRnn and SPKEnn must be
                      increased, and comments describing the record size
                      must be changed.

                      The current value of MAXDEG is 15.
#### Exceptions
       If any of the following exceptions occur, this routine will return
       without creating a new segment.

       1)  If FRAME is not a recognized name, the error
           SPICE(INVALIDREFFRAME) is signaled.

       2)  If the last non-blank character of SEGID occurs past index 40,
           the error SPICE(SEGIDTOOLONG) is signaled.

       3)  If SEGID contains any nonprintable characters, the error
           SPICE(NONPRINTABLECHARS) is signaled.

       4)  If DEGREE is not at least 1 or is greater than MAXDEG, the
           error SPICE(INVALIDDEGREE) is signaled.

       5)  If the number of states N is not at least DEGREE+1, the error
           SPICE(TOOFEWSTATES) will be signaled.

       6)  If FIRST is greater than LAST then the error
           SPICE(BADDESCRTIMES) will be signaled.

       7)  If STEP is non-positive, the error SPICE(INVALIDSTEPSIZE) will
           be signaled.

       8)  If the first epoch EPOCH1 is greater than FIRST, the error
           SPICE(BADDESCRTIMES) will be signaled.

       9)  If the last epoch

              FIRST + (N-1)*STEP

           is less than LAST, the error SPICE(BADDESCRTIMES) will be
           signaled.

       10) The error SPICE(EMPTYSTRING) is signaled if either input
           string does not contain at least one character, since the
           input strings cannot be converted to a Fortran-style string
           in this case.

       11) The error SPICE(NULLPOINTER) is signaled if either input string
           pointer is null.
#### Files
       A new type 8 SPK segment is written to the SPK file attached
       to handle.
#### Particulars
       This routine writes an SPK type 08 data segment to the open SPK
       file according to the format described in the type 08 section of
       the SPK Required Reading. The SPK file must have been opened with
       write access.
#### Examples
       Suppose that you have states and are prepared to produce
       a segment of type 08 in an SPK file.

       The following code fragment could be used to add the new segment
       to a previously opened SPK file attached to HANDLE. The file must
       have been opened with write access.

          #include "SpiceUsr.h"
               .
               .
               .

          /.
          First open the SPK file and get a handle for it.
          ./
          spkopa_c ( spknam, &handle );

          /.
          Create a segment identifier.
          ./
          segid = "MY_SAMPLE_SPK_TYPE_8_SEGMENT";

          /.
          Write the segment.
          ./
          spkw08_c (  handle,  body,    center,  frame,
                      first,   last,    segid,   degree,
                      n,       states,  epoch1,  step     );

          /.
          Close the file.
          ./
          spkcls_c ( handle );
#### Restrictions
       None.
#### Literature_References
       None.
#### Author_and_Institution
       K.R. Gehringer (JPL)
       N.J. Bachman   (JPL)
       J.M. Lynch     (JPL)
       W.L. Taber     (JPL)
#### Version
       -CSPICE Version 1.0.0, 29-JUN-1999 (NJB)
#### Index_Entries
       write spk type_8 ephemeris data segment
#### Link to routine spkw08_c source file spkw08_c.c

    Wed Jun  9 13:05:30 2010