NAME

       MPI_Graph_map  - Maps process to graph topology information.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Graph_map(MPI_Comm comm, int nnodes, const int index[],
            const int edges[], int *newrank)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_GRAPH_MAP(COMM, NNODES, INDEX, EDGES, NEWRANK, IERROR)
            INTEGER   COMM, NNODES, INDEX(*), EDGES(*), NEWRANK, IERROR

C++ Syntax

       #include <mpi.h>
       int Graphcomm::Map(int nnodes, const int index[],
            const int edges[]) const

INPUT PARAMETERS

       comm      Input communicator (handle).

       nnodes    Number of graph nodes (integer).

       index     Integer array specifying the graph structure, see  MPI_Graph_ create.

       edges     Integer array specifying the graph structure.

OUTPUT PARAMETERS

       newrank   Reordered rank of the calling process; MPI_UNDEFINED if the calling process does
                 not belong to graph (integer).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Cart_map and MPI_Graph_map can be used to implement all other topology  functions.  In
       general  they  will  not  be  called  by  the  user directly, unless he or she is creating
       additional virtual topology capability other than that provided by MPI.

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++ functions 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_Cart_map