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MPI_Group_incl(3) man page (version 1.2.9)

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NAME

       MPI_Group_incl   - Produces a group by reordering an existing group and
       taking only listed members.

SYNTAX


C Syntax

       #include <mpi.h>
       int MPI_Group_incl(MPI_Group group, int n, int *ranks,
            MPI_Group *newgroup)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_GROUP_INCL(GROUP, N, RANKS, NEWGROUP, IERROR)
            INTEGER   GROUP, N, RANKS(*), NEWGROUP, IERROR

C++ Syntax

       #include <mpi.h>
       Group Group::Incl(int n, const int ranks[]) const

INPUT PARAMETERS

       group     Group (handle).

       n         Number  of  elements  in  array  ranks  (and  size  of   new-
                 group)(integer).

       ranks     Ranks  of  processes in group to appear in newgroup (array of
                 integers).

OUTPUT PARAMETERS

       newgroup  New group derived from above, in the order defined  by  ranks
                 (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       The  function MPI_Group_incl creates a group group_out that consists of
       the n processes in  group  with  ranks  rank[0],  ...,  rank[n-1];  the
       process  with  rank i in group_out is the process with rank ranks[i] in
       group. Each of the n elements of ranks must be a valid  rank  in  group
       and all elements must be distinct, or else the program is erroneous. If
       n = 0, then  group_out  is  MPI_GROUP_EMPTY.  This  function  can,  for
       instance, be used to reorder the elements of a group.

NOTE

       This  implementation  does not currently check to ensure that there are
       no duplicates in the list of ranks.

ERRORS

       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-
       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

       MPI_Group_compare
       MPI_Group_range_incl
       MPI_Group_free

Open MPI 1.2                    September 2006        MPI_Group_incl(3OpenMPI)

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