MPI_Group_range_incl(3OpenMPI)											    MPI_Group_range_incl(3OpenMPI)

NAME

       MPI_Group_range_incl - Creates a new group from ranges of ranks in an existing group.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Group_range_incl(MPI_Group group, int n, int ranges[][3],
	    MPI_Group *newgroup)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GROUP_RANGE_INCL(GROUP, N, RANGES, NEWGROUP, IERROR)
	    INTEGER   GROUP, N, RANGES(3,*), NEWGROUP, IERROR

C++ Syntax
       #include <mpi.h>
       Group Group::Range_incl(int n, const int ranges[][3]) const

INPUT PARAMETERS

       group	 Group (handle).

       n	 Number of triplets in array ranges (integer).

       ranges	 A  one-dimensional  array of integer triplets, of the form (first rank, last rank, stride) indicating ranks in group or processes
		 to be included in newgroup.

OUTPUT PARAMETERS

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

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       If ranges consist of the triplets

	   (first1, last1, stride1), ..., (firstn, lastn, striden)

       then newgroup consists of the sequence of processes in group with ranks

							last(1)-first(1)
	 first(1), first(1) + stride(1),..., first(1) + ---------------- stride(1),...
							    stride(1)

							last(n)-first(n)
	 first(n), first(n) + stride(n),..., first(n) + ---------------- stride(n).
							    stride(n)

       Each computed rank must be a valid rank in group and all computed ranks must be distinct, or else the program is erroneous.  Note  that	we
       may have first(i) > last(i), and stride(i) may be negative, but cannot be zero.

       The  functionality  of  this  routine  is specified to be equivalent to expanding the array of ranges to an array of the included ranks and
       passing the resulting array of ranks and other arguments  to  MPI_Group_incl.  A  call  to  MPI_Group_incl  is  equivalent  to  a  call	to
       MPI_Group_range_incl with each rank i in ranks replaced by the triplet (i,i,1) in the argument ranges.

NOTE

       This implementation does not currently check to see that the list of ranges to include are valid ranks in the group.

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-
       tions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, 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 MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN  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_incl
       MPI_Group_free

Open MPI 1.2							  September 2006				    MPI_Group_range_incl(3OpenMPI)