Procedure

   void orderi_c ( ConstSpiceInt  * array,
                   SpiceInt         ndim,
                   SpiceInt       * iorder ) 

Abstract

 
   Determine the order of elements in an integer array. 
 

Required_Reading

 
   None. 
 

Keywords

 
   ARRAY,  SORT 
 

Brief_I/O

 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   array      I    Input array. 
   ndim       I    Dimension of array. 
   iorder     O    Order vector for array. 
 

Detailed_Input

 
   array       is the input array. 
 
   ndim        is the number of elements in the input array. 
 

Detailed_Output

 
   iorder      is the order vector for the input array. 
               iorder[0] is the index of the smallest element 
               of array; iorder[1] is the index of the next 
               smallest; and so on. 

               The elements of iorder range from zero to ndim-1.
 

Parameters

 
   None. 
 

Exceptions

 
   1) A negative input dimension causes this routine to
      leave the output order vector unchanged.

   This routine is error free. 

Files

 
   None. 
 

Particulars

 
   orderi_c finds the index of the smallest element of the input 
   array. This becomes the first element of the order vector. 
   The process is repeated for the rest of the elements. 

   The order vector returned by orderi_c may be used by any of 
   the reord*_c routines to sort sets of related arrays, as shown 
   in the example below. 

Examples

 
   In the following example, the order*_c and reord*_c routines are 
   used to sort four related arrays (containing the names, 
   masses, integer ID codes, and visual magnitudes for a group 
   of satellites). This is representative of the typical use of 
   these routines. 

      #include "SpiceUsr.h"
            .
            .
            .
      /.
      Sort the object arrays by ID code. 
      ./ 

      orderi_c ( codes,  n,         iorder ); 

      reordc_c ( iorder, n, namlen, names  );
      reordd_c ( iorder, n,         masses ); 
      reordi_c ( iorder, n,         codes  ); 
      reordd_c ( iorder, n,         vmags  );

Restrictions

 
   None. 
  

Literature_References

 
   None. 
 

Author_and_Institution

 
   N.J. Bachman    (JPL)
   I.M. Underwood  (JPL) 
 

Version

 
   -CSPICE Version 1.0.1, 23-MAR-2010 (NJB)

      Header example was updated to show use of this routine.
      Exceptions section was updated. Header sections were
      re-ordered.

   -CSPICE Version 1.0.0, 08-JUL-2002 (NJB) (IMU)

Index_Entries

 
   order of an integer array 
 

Link to routine orderi_c source file orderi_c.c