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

4.1.6                                             Sep 30, 2023                 MPI_Dist_graph_neighbors_count(3)