Procedure

   void orderc_c ( SpiceInt      lenvals,
                   const void  * array,
                   SpiceInt      ndim,
                   SpiceInt    * iorder  ) 

Abstract

 
   Determine the order of elements in an array of character strings. 
 

Required_Reading

 
   None. 
 

Keywords

 
   ARRAY,  SORT 
 

Brief_I/O

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

Detailed_Input

 
   lenvals     is the declared length of the strings in the input
               string array, including null terminators.  The input   
               array should be declared with dimension 

                  [ndim][lenvals]

   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. Strings are ordered according 
               to the ASCII collating sequence.  Trailing white space
               is ignored when comparing strings.

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

Parameters

 
   None. 
 

Exceptions

 
   1) If the input string pointer is null, the error
      SPICE(NULLPOINTER) will be signaled.
 
   2) If the input array string's length is less than 2, the error
      SPICE(STRINGTOOSHORT) will be signaled.

   3) If ndim < 1, this routine returns immediately.  This case is not 
      considered an error.

Files

 
   None. 
 

Particulars

 
   orderc_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 orderc_c may be used by any of 
   the reord* routines to sort sets of related arrays, as shown 
   in the example below. 
 

Examples

 
   In the following example, the order and reord 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 name. 
       ./ 
       
       orderc_c ( namlen, names, n,  iorder ); 
 
       reordc_c ( iorder, n, namlen, names  );
       reordd_c ( iorder, n,         masses ); 
       reordi_c ( iorder, n,         codes  ); 
       reordd_c ( iorder, n,         vmags  );    

Restrictions

  
   1)  String comparisons performed by this routine are Fortran-style:
       trailing blanks in the input array or key value are ignored.
       This gives consistent behavior with CSPICE code generated by
       the f2c translator, as well as with the Fortran SPICE Toolkit.
      
       Note that this behavior is not identical to that of the ANSI
       C library functions strcmp and strncmp.
  

Literature_References

 
   None. 
 

Author_and_Institution

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

Version

 
   -CSPICE Version 1.0.0, 18-JUL-2002 (NJB) (IMU)

Index_Entries

 
   order of a character array 
 

Link to routine orderc_c source file orderc_c.c