#include "mpi.h" int MPI_Graph_create ( comm_old, nnodes, index, edges, reorder, comm_graph ) MPI_Comm comm_old; int nnodes; int *index; int *edges; int reorder; MPI_Comm *comm_graph;
comm_old  input communicator without topology (handle)
 
nnodes  number of nodes in graph (integer)
 
index  array of integers describing node degrees (see below)
 
edges  array of integers describing graph edges (see below)
 
reorder  ranking may be reordered (true) or not (false) (logical)

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGERin Fortran.
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 lastargument. Before the value is returned, the current MPI error handler iscalled. By default, this error handler aborts the MPI job. The error handlermay be changed with MPI_Errhandler_set; the predefined error handlerMPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue pastan error.
Location:graphcreate.c