Procedure

   dskgtl_c ( DSK, get tolerance ) 

   void dskgtl_c ( SpiceInt        keywrd,
                   SpiceDouble   * dpval  )

Abstract

   Retrieve the value of a specified DSK tolerance or margin parameter.

Required_Reading

   DSK

Keywords

   DSK
   MARGIN
   NUMERIC
   TOLERANCE

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   keywrd     I   Code specifying parameter to retrieve.
   dpval      O   Value of parameter.

Detailed_Input

   keywrd      is an integer code specifying the parameter to
               retrieve. See the include file SpiceDtl.h for
               a description of the possible keywords.

Detailed_Output

   dpval       is the value of the parameter specified by `keywrd'.

Parameters

   See the header file

      SpiceDtl.h

   for descriptions and values of the tolerance or margin parameters
   accessed by this routine, and of the keyword parameters used to
   refer to them.

Exceptions

   1)  If the input keyword is not recognized, the error
       SPICE(INDEXOUTOFRANGE) is signaled by a routine in the call tree
       of this routine.

Files

   None.

Particulars

   The DSK tolerance routines centralize numeric tolerance and margin
   values used by the DSK subsystem. The DSK subsystem retrieves values
   from the DSK tolerance subsystem to use at run time.

   The DSK tolerance access functions are

      dskgtl_c {DSK, get tolerance value}
      dskstl_c {DSK, set tolerance value}

   To minimize run time overhead, the "keywords" used by these routines
   to identify parameters are actually integer codes.

   SPICE users may override certain values maintained by this subsystem;
   others values are fixed. It is recommended that any change to the
   tolerance values made at run time be performed only by expert SPICE
   users.

Examples

   The numerical results shown for this example may differ across
   platforms. The results depend on the SPICE kernels used as
   input, the compiler and supporting libraries, and the machine
   specific arithmetic implementation.

   1) Obtain and display the DSK type 2 plate expansion fraction.


      Example code begins here.


      /.
         Program dskgtl_ex1
      ./
      #include <stdio.h>
      #include "SpiceUsr.h"

      int main()
      {
         SpiceDouble             dpval;

         dskgtl_c ( SPICE_DSK_KEYXFR, &dpval );

         printf ( "Plate expansion fraction = %e\n", dpval );

         return ( 0 );
      }


      When this program was executed on a Mac/Intel/cc/64-bit
      platform, the output was:


      Plate expansion fraction = 1.000000e-10

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   N.J. Bachman        (JPL)
   J. Diaz del Rio     (ODC Space)

Version

   -CSPICE Version 1.0.1, 02-JUL-2021 (JDR)

       Edited the header to comply with NAIF standard. Corrected
       CSPICE include file name reference in "keywrd" description.

       Updated INDEXOUTOFRANGE exception description.

   -CSPICE Version 1.0.0, 27-FEB-2016 (NJB)

Index_Entries

   retrieve DSK tolerance or margin parameters