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Index Page removd_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

       removd_c ( Remove an item from a double precision set )

       void removd_c ( SpiceDouble     item,
                       SpiceCell     * a    )

#### Abstract

       Remove an item from a double precision set.

#### Required_Reading

       SETS

#### Keywords

       CELLS
       SETS

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       item       I   Item to be removed.
       a         I-O  Removal set.

#### Detailed_Input

       item        is an item which is to be removed from the specified set.
                   `item' may or may not already be an element of the set.

       a           is a set.

                   On input, `a' may or may not contain the input item as an
                   element.

                   `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

       a           on output, contains the difference of the input set and
                   the input item. If the item is not an element of the set,
                   the set is not changed.

#### Parameters

       None.

#### Exceptions

       1)  The data values in set `a' must be monotone strictly increasing.
           This is not checked. If this condition is not met, the results
           are unpredictable.

       2)  If the `a' cell argument has a type other than SpiceDouble,
           the error SPICE(TYPEMISMATCH) is signaled.

       3)  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.

#### Files

       None.

#### Particulars

       None.

#### 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) Create an integer set for ten elements, insert items
          to it and then remove the even values.

          Example code begins here.

          /.
             Program removd_ex1
          ./
          #include <stdio.h>
          #include "SpiceUsr.h"

          int main( )
          {

             /.
             Local constants.
             ./
             #define SETDIM       10

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

             /.
             Create a list of items and even numbers.
             ./
             SpiceDouble          even   [SETDIM] = {
                                              0.0,  2.0,  4.0,  6.0,  8.0,
                                             10.0, 12.0, 14.0, 16.0, 18.0  };

             SpiceDouble          items  [SETDIM] = {
                                              0.0,  1.0,  1.0,  2.0,  3.0,
                                              5.0,  8.0, 10.0, 13.0, 21.0  };

             /.
             Initialize the empty set.
             ./
             valid_c ( SETDIM, 0, &a );

             /.
             Insert the list of double precision numbers into the
             set. If the item is an element of the set, the set is
             not changed.
             ./
             for ( i = 0; i < SETDIM; i++ )
             {
                insrtd_c ( items[i], &a );
             }

             /.
             Output the original contents of set `a'.
             ./
             printf( "Items in original set A:\n" );

             for ( i = 0; i < card_c( &a ); i++ )
             {
                printf( "%6.1f", SPICE_CELL_ELEM_D( &a, i ) );
             }

             printf( " \n" );

             /.
             Remove the even values. If the item is not an element of
             the set, the set is not changed.
             ./
             for ( i = 0; i < SETDIM; i++ )
             {
                removd_c ( even[i], &a );
             }

             /.
             Output the contents of `a'.
             ./
             printf( "Odd numbers in set A:\n" );

             for ( i = 0; i < card_c( &a ); i++ )
             {
                printf( "%6.1f", SPICE_CELL_ELEM_D( &a, i ) );
             }

             printf( " \n" );

             return ( 0 );
          }

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

          Items in original set A:
             0.0   1.0   2.0   3.0   5.0   8.0  10.0  13.0  21.0
          Odd numbers in set A:
             1.0   3.0   5.0  13.0  21.0

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

       N.J. Bachman        (JPL)
       C.A. Curzon         (JPL)
       J. Diaz del Rio     (ODC Space)
       W.L. Taber          (JPL)
       I.M. Underwood      (JPL)

#### Version

       -CSPICE Version 1.1.0, 24-AUG-2021 (JDR)

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

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

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

           Added entry #1 in -Exceptions section.

       -CSPICE Version 1.0.0, 07-AUG-2002 (NJB) (CAC) (WLT) (IMU)

#### Index_Entries

       remove an item from a d.p. set

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

    Fri Dec 31 18:41:11 2021