NAME

       MPI_Dist_graph_neighbors_count   -  Returns the number of in and out edges for the calling
       processes in a distributed graph topology and a flag indicating  whether  the  distributed
       graph is weighted.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Dist_graph_neighbors_count(MPI_Comm comm, int *indegree,
            int *outdegree, int *weighted)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_DIST_GRAPH_NEIGHBORS_COUNT(COMM, INDEGREE, OUTDEGREE, WEIGHTED, IERROR)
            INTEGER   COMM, INDEGREE, OUTDEGREE, IERROR
               LOGICAL WEIGHTED

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Dist_graph_neighbors_count(comm, indegree, outdegree, weighted, ierror)
            TYPE(MPI_Comm), INTENT(IN) :: comm
            INTEGER, INTENT(IN) :: indegree, outdegree
            INTEGER, INTENT(OUT) :: weighted
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

       comm      Communicator with distributed graph topology (handle).

OUTPUT PARAMETERS

       indegree  Number of edges into this process (non-negative integer).

       outdegree Number of edges out of this process (non-negative integer).

       weighted  False if MPI_UNWEIGHTED was supplied during creation, true otherwise (logical).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Dist_graph_neighbors_count and MPI_Graph_neighbors provide adjacency information for a
       distributed graph topology. MPI_Dist_graph_neighbors_count returns the number  of  sources
       and destinations for the calling process.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument.

       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_Dist_graph_neighbors