Procedure

     REMOVC ( Remove an item from a character set )

     SUBROUTINE REMOVC ( ITEM, A )

Abstract

     Remove an item from a character set.

Required_Reading

     SETS

Keywords

     CELLS
     SETS

Declarations

     IMPLICIT NONE

     INTEGER               LBCELL
     PARAMETER           ( LBCELL = -5 )

     CHARACTER*(*)         ITEM
     CHARACTER*(*)         A       ( LBCELL:* )

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.
              Trailing blanks in ITEM are not significant.

     A        is a SPICE set.

              On input, A may or may not contain the input item as an
              element.

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)  If the input set A has invalid cardinality, an error is
         signaled by a routine in the call tree of this routine.

     2)  If the input set A has invalid size, an error is signaled by a
         routine in the call tree of this routine.

     3)  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.

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 a set with all the original planets of the Solar
        System and then remove Pluto from that set.


        Example code begins here.


              PROGRAM REMOVC_EX1
              IMPLICIT NONE

        C
        C     SPICELIB functions.
        C
              INTEGER                 CARDC

        C
        C     Local constants.
        C
              INTEGER                 LBCELL
              PARAMETER             ( LBCELL = -5  )

              INTEGER                 PNAMSZ
              PARAMETER             ( PNAMSZ   = 7 )

              INTEGER                 SETDIM
              PARAMETER             ( SETDIM   = 9 )

        C
        C     Local variables.
        C
              CHARACTER*(PNAMSZ)      LIST   ( SETDIM        )
              CHARACTER*(PNAMSZ)      PLNETS ( LBCELL:SETDIM )

              INTEGER                 I

        C
        C     Create the original planets list.
        C
              DATA                    LIST  /
             .                'MERCURY', 'VENUS',   'EARTH',
             .                'MARS',    'JUPITER', 'SATURN',
             .                'URANUS',  'NEPTUNE', 'PLUTO'   /

        C
        C     Initialize the empty set.
        C
              CALL VALIDC ( SETDIM, 0, PLNETS )

        C
        C     Insert the list of planets into the set. If the item is
        C     an element of the set, the set is not changed.
        C
              DO I = 1, SETDIM

                 CALL INSRTC ( LIST(I), PLNETS )

              END DO

        C
        C     Remove the Pluto from the set. If the Pluto is not an
        C     element of the set, the set is not changed.
        C
              CALL REMOVC ( 'PLUTO', PLNETS )

        C
        C     Output the contents of PLNETS.
        C
              WRITE(*,*) 'Planets of the Solar System:'

              DO I = 1, CARDC ( PLNETS )

                 WRITE(*,*) '   ', PLNETS(I)

              END DO

              END


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


         Planets of the Solar System:
            EARTH
            JUPITER
            MARS
            MERCURY
            NEPTUNE
            SATURN
            URANUS
            VENUS

Restrictions

     None.

Literature_References

     None.

Author_and_Institution

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

Version

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

        Added IMPLICIT NONE statement.

        Edited the header to comply with NAIF standard. Added complete
        code example. Extended the $Exceptions section.

        Updated description of argument ITEM to indicate that trailing
        blanks are not significant

        Removed unnecessary $Revisions section.

    SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)

        Comment section for permuted index source lines was added
        following the header.

    SPICELIB Version 1.0.0, 31-JAN-1990 (CAC) (WLT) (IMU)