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spkw13_c
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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 spkw13_c ( SpiceInt             handle,
                   SpiceInt             body,
                   SpiceInt             center, 
                   ConstSpiceChar     * frame,
                   SpiceDouble          first,
                   SpiceDouble          last,
                   ConstSpiceChar     * segid,
                   SpiceInt             degree,
                   SpiceInt             n,
                   ConstSpiceDouble     states[][6],
                   ConstSpiceDouble     epochs[]     )

Abstract

 
   Write a type 13 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. 
   epochs     I   Array of epochs corresponding to 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 Hermite 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. 
 
   epochs         is an array of epochs corresponding to the members 
                  of the state array.  The epochs are specified as 
                  seconds past J2000, TDB. 
 

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 SPICELIB routine SPKPVN 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. 
 

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 degree is not odd, the error SPICE(INVALIDDEGREE) is  
       signaled. 
 
   6)  If the number of states n is not at least (degree+1)/2,  
       the error SPICE(TOOFEWSTATES) will be signaled. 
 
   7)  If first is greater than or equal to last then the error 
       SPICE(BADDESCRTIMES) will be signaled. 
 
   8)  If the elements of the array epochs are not in strictly 
       increasing order, the error SPICE(TIMESOUTOFORDER) will be 
       signaled. 
 
   9)  If the first epoch epochs[0] is greater than first, the error 
       SPICE(BADDESCRTIMES) will be signaled. 
 
   10) If the last epoch epochs[n-1] is less than last, the error 
       SPICE(BADDESCRTIMES) will be signaled. 
 
   11) If either the input frame or segment ID string pointer is null,
       the error SPICE(NULLPOINTER) is signaled.
   
   12) If either the input frame or segment ID string is empty,
       the error SPICE(EMPTYSTRING) is signaled.
   
 

Files

 
   A new type 13 SPK segment is written to the SPK file attached 
   to HANDLE. 
 

Particulars

 
   This routine writes an SPK type 13 data segment to the open SPK 
   file according to the format described in the type 13 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 13 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"
           .
           .
           .
        
      /.
      Create a segment identifier. 
      ./
      #define  SEGID  "MY_SAMPLE_SPK_TYPE_13_SEGMENT" 
 
        
      /.
      Write the segment. 
      ./
        
      spkw13_c ( handle,  body,    center,  frame, 
                 first,   last,    segid,   degree, 
                 n,       states,  epochs          );
 

Restrictions

 
   None. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   N.J. Bachman   (JPL) 
 

Version

 
   -CSPICE Version 1.0.0, 15-FEB-2000 (NJB)

Index_Entries

 
   write spk type_13 ephemeris data segment 
 
Wed Apr  5 17:54:44 2017