Index of Functions: A B C D E F G H I J K L M N O P Q R S T U V W X
Index Page elemd_c
Table of contents
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
       elemd_c ( Element of a double precision set )

       SpiceBoolean elemd_c ( SpiceDouble     item,
                              SpiceCell     * a    )
#### Abstract
       Determine whether an item is an element of a double precision set.
#### Required_Reading
       SETS
#### Keywords
       CELLS
       SETS
#### Brief_I/O
       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       item       I   Item to be tested.
       a          I   Set to be tested.

       The function returns SPICETRUE if `item' is an element of `a'.
#### Detailed_Input
       item        is an item which may or may not be an element of the
                   input set.

       a           is a SPICE set.

                   `a' must be declared as a double precision SpiceCell.

                   CSPICE provides the following macro, which declares and
                   initializes the cell

                      SPICEDOUBLE_CELL        ( a, ASZ );

                   where ASZ is the maximum capacity of `a'.
#### Detailed_Output
       The function returns SPICETRUE if `item' is a member of the set `a', and
       returns SPICEFALSE otherwise.
#### Parameters
       None.
#### Exceptions
       1)  If the `a' cell argument has a type other than SpiceDouble,
           the error SPICE(TYPEMISMATCH) is signaled. The function
           returns the value SPICEFALSE.

       2)  If the `a' cell argument does not qualify as a SPICE set, the
           error SPICE(NOTASET) is signaled. SPICE sets have their data
           elements stored in increasing order and contain no duplicate
           elements. The function returns the value SPICEFALSE.
#### Files
       None.
#### Particulars
       This routine uses a binary search to check for the presence in the set
       of the specified item.
#### 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) Check if the elements of a list of double precision numbers
          belong to a given double precision set.

          Example code begins here.

          /.
             Program elemd_ex1
          ./
          #include <stdio.h>
          #include "SpiceUsr.h"

          int main( )
          {

             /.
             Local constants.
             ./
             #define LISTSZ       6
             #define SETDIM       8

             /.
             Local variables.
             ./
             SPICEDOUBLE_CELL   ( a     , SETDIM );
             SpiceInt             i;

             /.
             Set the values of the set and the list of double
             precision numbers.
             ./
             SpiceDouble          values [SETDIM] = {
                                                 -1.0, 0.0, 1.0,  1.0,
                                                  3.0, 5.0, 0.0, -3.0 };

             SpiceDouble          items  [LISTSZ] = { 6.0, -1.0,  0.0,
                                                      2.0,  3.0, -2.0 };

             /.
             Add the values to the integer set using appndd_c. The
             results of these calls results in a cell which does not
             qualify as a set.
             ./
             for ( i = 0; i < SETDIM; i++ )
             {
                appndd_c ( values[i], &a );
             }

             /.
             Initialize the set by validating the cell: remove duplicates
             and sort the elements in increasing order.
             ./
             valid_c ( SETDIM, SETDIM, &a );

             /.
             Check if the items in the list belong to the set.
             ./
             for ( i = 0; i < LISTSZ; i++ )
             {
                if ( elemd_c ( items[i], &a ) )
                {
                   printf( "Item %5.1f is in the set.\n", items[i] );
                }
                else
                {
                   printf( "Item %5.1f is NOT in the set.\n", items[i] );
                }
             }

             return ( 0 );
          }

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

          Item   6.0 is NOT in the set.
          Item  -1.0 is in the set.
          Item   0.0 is in the set.
          Item   2.0 is NOT in the set.
          Item   3.0 is in the set.
          Item  -2.0 is NOT in the set.
#### Restrictions
       None.
#### Literature_References
       None.
#### Author_and_Institution
       N.J. Bachman        (JPL)
       C.A. Curzon         (JPL)
       J. Diaz del Rio     (ODC Space)
       H.A. Neilan         (JPL)
       W.L. Taber          (JPL)
       I.M. Underwood      (JPL)
#### Version
       -CSPICE Version 1.1.0, 24-AUG-2021 (JDR)

           Edited the -Examples section to comply with NAIF standard.
           Added complete code example.

           Changed the argument name "set" to "a" for consistency with other
           routines.

           Cast returned value type to SpiceBoolean.

           Extended description of argument "a" in -Detailed_Input to include
           type and preferred declaration method.

       -CSPICE Version 1.0.0, 07-AUG-2002 (NJB) (CAC) (HAN) (WLT) (IMU)
#### Index_Entries
       element of a d.p. set
#### Link to routine elemd_c source file elemd_c.c

    Fri Dec 31 18:41:06 2021