MPI_Group_incl

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

Synopsis

#include "mpi.h"
int MPI_Group_incl ( group, n, ranks, group_out )
MPI_Group group, *group_out;
int       n, *ranks;

Input Parameters

	group	group (handle)
	n	number of elements in array `ranks` (and size of newgroup ) (integer)
	ranks	ranks of processes in `group` to appear in `newgroup` (array of integers)

Output Parameter

newgroup: new group derived from above, in the order defined by ranks (handle)

Note

This implementation does not currently check to see that the list ofranks to ensure that there are no duplicates.

Notes for Fortran

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) havean additional argument ierr at the end of the argument list. ierris an integer and has the same meaning as the return value of the routinein C. In Fortran, MPI routines are subroutines, and are invoked with thecall statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGERin Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the lastargument. Before the value is returned, the current MPI error handler iscalled. By default, this error handler aborts the MPI job. The error handlermay be changed with MPI_Errhandler_set; the predefined error handlerMPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue pastan error.

MPI_SUCCESS: No error; MPI routine completed successfully.

MPI_ERR_GROUP: Null group passed to function.

MPI_ERR_ARG: Invalid argument. Some argument is invalid and is not identified by a specific error class (e.g., MPI_ERR_RANK).

MPI_ERR_INTERN: This error is returned when some part of the MPICH implementation is unable to acquire memory.

MPI_ERR_RANK: Invalid source or destination rank. Ranks must be between zero and the size of the communicator minus one; ranks in a receive (MPI_Recv, MPI_Irecv, MPI_Sendrecv, etc.) may also be MPI_ANY_SOURCE.