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.TH "MPI_GROUP_INCL" "3" "Apr 11, 2024" "" "Open MPI"
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\fI\%MPI_Group_incl\fP — Produces a group by reordering an existing group and
taking only listed members.
.SH SYNTAX
.SS C Syntax
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.INDENT 3.5
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.EX
#include <mpi.h>

int MPI_Group_incl(MPI_Group group, int n, const int ranks[],
    MPI_Group *newgroup)
.EE
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.SS Fortran Syntax
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.EX
USE MPI
! or the older form: INCLUDE \(aqmpif.h\(aq

MPI_GROUP_INCL(GROUP, N, RANKS, NEWGROUP, IERROR)
    INTEGER GROUP, N, RANKS(*), NEWGROUP, IERROR
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.SS Fortran 2008 Syntax
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.EX
USE mpi_f08

MPI_Group_incl(group, n, ranks, newgroup, ierror)
    TYPE(MPI_Group), INTENT(IN) :: group
    INTEGER, INTENT(IN) :: n, ranks(n)
    TYPE(MPI_Group), INTENT(OUT) :: newgroup
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.SH INPUT PARAMETERS
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.IP \(bu 2
\fBgroup\fP : Group (handle).
.IP \(bu 2
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.B \fBn\fP
Number of elements in array ranks (and size of
newgroup)(integer).
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.IP \(bu 2
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.B \fBranks\fP
Ranks of processes in group to appear in newgroup (array of
integers).
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.SH OUTPUT PARAMETERS
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.IP \(bu 2
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.B \fBnewgroup\fP
New group derived from above, in the order defined by
ranks (handle).
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.IP \(bu 2
\fBierror\fP : Fortran only: Error status (integer).
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.SH DESCRIPTION
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The function \fI\%MPI_Group_incl\fP 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.
.SH NOTE
.sp
This implementation does not currently check to ensure that there are no
duplicates in the list of ranks.
.SH ERRORS
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Almost all MPI routines return an error value; C routines as the return result
of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler associated
with the communication object (e.g., communicator, window, file) is called.
If no communication object is associated with the MPI call, then the call is
considered attached to MPI_COMM_SELF and will call the associated MPI error
handler. When MPI_COMM_SELF is not initialized (i.e., before
\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
Model exclusively) the error raises the initial error handler. The initial
error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
handler is called for all other MPI functions.
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Open MPI includes three predefined error handlers that can be used:
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.IP \(bu 2
\fBMPI_ERRORS_ARE_FATAL\fP
Causes the program to abort all connected MPI processes.
.IP \(bu 2
\fBMPI_ERRORS_ABORT\fP
An error handler that can be invoked on a communicator,
window, file, or session. When called on a communicator, it
acts as if \fI\%MPI_Abort\fP was called on that communicator. If
called on a window or file, acts as if \fI\%MPI_Abort\fP was called
on a communicator containing the group of processes in the
corresponding window or file. If called on a session,
aborts only the local process.
.IP \(bu 2
\fBMPI_ERRORS_RETURN\fP
Returns an error code to the application.
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MPI applications can also implement their own error handlers by calling:
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.IP \(bu 2
\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
.IP \(bu 2
\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
.IP \(bu 2
\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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Note that MPI does not guarantee that an MPI program can continue past
an error.
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See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
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See the Error Handling section of the MPI\-3.1 standard for
more information.
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\fBSEE ALSO:\fP
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.INDENT 3.5
\fI\%MPI_Group_compare\fP
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.SH COPYRIGHT
2003-2024, The Open MPI Community
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