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NAME

       MPI_Graph_get -  Retrieves graph topology information associated with a  communicator

SYNOPSIS

       #include "mpi.h"
       int MPI_Graph_get ( MPI_Comm comm, int maxindex, int maxedges,
                          int *index, int *edges )

INPUT PARAMETERS

       comm   - communicator with graph structure (handle)
       maxindex
              - length of vector index in the calling program  (integer)
       maxedges
              - length of vector edges in the calling program  (integer)

OUTPUT PARAMETER

       index  -  array of integers containing the graph structure (for details see the definition
              of MPI_GRAPH_CREATE )
       edges  - array of integers containing the graph structure

NOTES FOR FORTRAN

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

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in 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 last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI job.  The error handler may be changed with MPI_Errhandler_set  ;  the  predefined
       error  handler  MPI_ERRORS_RETURN  may be used to cause error values to be returned.  Note
       that MPI does not guarentee that an MPI program can continue past an error.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_TOPOLOGY
              - Invalid topology.  Either there is no topology associated with this communicator,
              or it is not the correct type (e.g., MPI_CART when expecting MPI_GRAPH ).
       MPI_ERR_COMM
              -  Invalid  communicator.   A  common error is to use a null communicator in a call
              (not even allowed in MPI_Comm_rank ).
       MPI_ERR_ARG
              - Invalid argument.  Some argument is invalid and is not identified by  a  specific
              error class (e.g., MPI_ERR_RANK ).

LOCATION

       graph_get.c

                                             1/4/2002                            MPI_Graph_get(3)