MPIGraphneighborscount(3OpenMPI) MPIGraphneighborscount(3OpenMPI)

NAME
       MMPPIIGGrraapphhnneeiigghhbboorrssccoouunntt   - Returns the number of neighbors of a node
       associated with a graph topology.


SSYYNNTTAAXX
CC SSyynnttaaxx
       #include 
       int MPIGraphneighborscount(MPIComm comm, int rank,
            int *nneighbors)


FFoorrttrraann SSyynnttaaxx
       INCLUDE 'mpif.h'
       MPIGRAPHNEIGHBORSCOUNT(COMM, RANK, NNEIGHBORS, IERROR)
            INTEGER   COMM, RANK, NNEIGHBORS, IERROR


CC++++ SSyynnttaaxx
       #include 
       int Graphcomm::Getneighborscount(int rank) const


IINNPPUUTT PPAARRAAMMEETTEERRSS
       comm      Communicator with graph topology (handle).

       rank      Rank of process in group of comm (integer).


OOUUTTPPUUTT PPAARRAAMMEETTEERRSS
       nneighbors
                 Number of neighbors of specified process (integer).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPIGraphneighborscount  and  MPIGraphneighbors  provide  adjacency
       information  for  a  general, graph topology. MPIGraphneighborscount
       returns the number of neighbors for the process signified by rank.


EERRRROORRSS
       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::ERRORSTHROWEXCEPTIONS, 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
       MPICommseterrhandler; the predefined error handler MPIERRORSRETURN
       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
       MPIGraphneighbors




Open MPI 1.2                    September 20M0P6IGraphneighborscount(3OpenMPI)