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Index Page reordd_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

       reordd_c ( Reorder a double precision array )

       void reordd_c ( ConstSpiceInt      * iorder,
                       SpiceInt             ndim,
                       SpiceDouble        * array  )

#### Abstract

       Reorder the elements of a double precision array according to a
       given order vector.

#### Required_Reading

       None.

#### Keywords

       ARRAY
       SORT

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       iorder     I   Order vector to be used to re-order array.
       ndim       I   Dimension of array.
       array     I-O  Array to be re-ordered.

#### Detailed_Input

       iorder      is the order vector to be used to re-order the input
                   array. The first element of iorder is the index of
                   the first item of the re-ordered array, and so on.

                   Note that the order imposed by reordd_c is not the
                   same order that would be imposed by a sorting
                   routine. In general, the order vector will have
                   been created (by one of the order routines) for
                   a related array, as illustrated in the example below.

       ndim        is the number of elements in the input array.

       array       on input, is an array containing some number of
                   elements in unspecified order.

#### Detailed_Output

       array       on output, is the same array, with the elements
                   re-ordered as specified by iorder.

#### Parameters

       None.

#### Exceptions

       1)  If ndim < 2, this routine executes a no-op. This case is
           not an error.

       2)  If memory cannot be allocated to create the temporary variable
           required for the execution of the underlying Fortran routine,
           the error SPICE(MALLOCFAILED) is signaled.

#### Files

       None.

#### Particulars

       reordd_c uses a cyclical algorithm to re-order the elements of
       the array in place. After re-ordering, element iorder[0] of
       the input array is the first element of the output array,
       element iorder[1] is the input array is the second element of
       the output array, and so on.

       The order vector used by reordd_c is typically created for
       a related array by one of the order routines, as shown in
       the example below.

#### 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) Sort four related arrays containing the names, masses,
          integer ID codes, and flags indicating whether they have
          a ring system, for a group of planets.

          Example code begins here.

          /.
             Program reordd_ex1
          ./
          #include <stdio.h>
          #include "SpiceUsr.h"

          int main( )
          {

             /.
             Local constants.
             ./
             #define NDIM         8
             #define STRLEN       8

             /.
             Local variables.
             ./

             SpiceInt             i;
             SpiceInt             iorder [NDIM];

             /.
             Set the arrays containing the names, masses (given as
             ratios to of Solar GM to barycenter GM), integer ID
             codes, and flags indicating whether they have a ring
             system.
             ./
             SpiceChar            names  [NDIM][STRLEN] = {
                                     "MERCURY", "VENUS",  "EARTH",  "MARS",
                                     "JUPITER", "SATURN", "URANUS", "NEPTUNE" };

             SpiceDouble          masses [NDIM] = {     22032.080,   324858.599,
                                                       398600.436,    42828.314,
                                                    126712767.881, 37940626.068,
                                                      5794559.128,  6836534.065 };

             SpiceInt             codes  [NDIM] = { 199, 299, 399, 499,
                                                    599, 699, 799, 899 };

             SpiceBoolean         rings  [NDIM] = { SPICEFALSE, SPICEFALSE,
                                                    SPICEFALSE, SPICEFALSE,
                                                    SPICETRUE,  SPICETRUE,
                                                    SPICETRUE,  SPICETRUE  };

             /.
             Sort the object arrays by name.
             ./
             orderc_c ( STRLEN, names, NDIM,   iorder );

             reordc_c ( iorder, NDIM,  STRLEN, names  );
             reordd_c ( iorder, NDIM,  masses         );
             reordi_c ( iorder, NDIM,  codes          );
             reordl_c ( iorder, NDIM,  rings          );

             /.
             Output the resulting table.
             ./
             printf( " Planet   Mass(GMS/GM)  ID Code  Rings?\n" );
             printf( "-------  -------------  -------  ------\n" );

             for ( i = 0; i < NDIM; i++ )
             {

                printf( "%-7s %14.3f %8d %4d\n",
                        names[i], masses[i], codes[i], rings[i] );

             }

             return ( 0 );
          }

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

           Planet   Mass(GMS/GM)  ID Code  Rings?
          -------  -------------  -------  ------
          EARTH       398600.436      399    0
          JUPITER  126712767.881      599    1
          MARS         42828.314      499    0
          MERCURY      22032.080      199    0
          NEPTUNE    6836534.065      899    1
          SATURN    37940626.068      699    1
          URANUS     5794559.128      799    1
          VENUS       324858.599      299    0

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

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

#### Version

       -CSPICE Version 1.0.2, 27-AUG-2021 (JDR)

           Edited the header to comply with NAIF standard.
           Added complete code example.

       -CSPICE Version 1.0.1, 11-JAN-2003 (EDW)

           Trivial. Corrected 'Detailed_output' section
           header to 'Detailed_Output'.

       -CSPICE Version 1.0.0, 10-JUL-2002 (NJB)

#### Index_Entries

       reorder a d.p. array

#### Link to routine reordd_c source file reordd_c.c

    Fri Dec 31 18:41:11 2021