MPIGroupintersection(3OpenMPI) MPIGroupintersection(3OpenMPI)

NAME
       MMPPIIGGrroouuppiinntteerrsseeccttiioonn   -  Produces a group at the intersection of two
       existing groups.


SSYYNNTTAAXX
CC SSyynnttaaxx
       #include 
       int MPIGroupintersection(MPIGroup group1, MPIGroup group2,
            MPIGroup *newgroup)


FFoorrttrraann SSyynnttaaxx
       INCLUDE 'mpif.h'
       MPIGROUPINTERSECTION(GROUP1, GROUP2, NEWGROUP, IERROR)
            INTEGER   GROUP1, GROUP2, NEWGROUP, IERROR


CC++++ SSyynnttaaxx
       #include 
       static Group Group::Intersect(const Group& group1, const Group& group2)


IINNPPUUTT PPAARRAAMMEETTEERRSS
       group1    First group (handle).

       group2    Second group (handle).


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       newgroup  Intersection group (handle).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       The set-like operations are defined as follows:

         o    union - All elements of the first group (group1),  followed  by
              all elements of second group (group2) not in first.

         o    intersect  -  all  elements of the first group that are also in
              the second group, ordered as in first group.

         o    difference - all elements of the first group that  are  not  in
              the second group, ordered as in the first group.

       Note  that  for  these  operations the order of processes in the output
       group is determined primarily by order in the first group (if possible)
       and then, if necessary, by order in the second group. Neither union nor
       intersection are commutative, but both are associative.

       The new group can be empty, that is, equal to MPIGROUPEMPTY.


EERRRROORRSS
       Almost all MPI routines return an error value; C routines as the  value
       of  the  function  and Fortran routines in the last argument. C++ func-
       tions do not return errors. If the default  error  handler  is  set  to
       MPI::ERRORSTHROWEXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI  error  handler  is
       called.  By  default, this error handler aborts the MPI job, except for
       I/O  function  errors.  The  error  handler   may   be   changed   with
       MPICommseterrhandler; the predefined error handler MPIERRORSRETURN
       may be used to cause error values to be returned. Note  that  MPI  does
       not guarantee that an MPI program can continue past an error.


SEE ALSO
       MPIGroupfree





Open MPI 1.2                    September 2006MPIGroupintersection(3OpenMPI)