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MPI_Cart_rank(3)		      MPI		      MPI_Cart_rank(3)

NAME
       MPI_Cart_rank  -	  Determines process rank in communicator given	Carte-
       sian location

SYNOPSIS
       int MPI_Cart_rank(MPI_Comm comm,	MPICH2_CONST int *coords, int *rank)

INPUT PARAMETERS
       comm   -	communicator with cartesian structure (handle)
       coords -	integer	array (of size ndims , the number of dimensions	of the
	      Cartesian	 topology associated with comm ) specifying the	carte-
	      sian coordinates of a process

OUTPUT PARAMETER
       rank   -	rank of	specified process (integer)

NOTES
       Out-of-range coordinates	are  erroneous	for  non-periodic  dimensions.
       Versions	 of  MPICH before 1.2.2	returned MPI_PROC_NULL for the rank in
       this case.

THREAD AND INTERRUPT SAFETY
       This routine is both thread- and	interrupt-safe.	 This means that  this
       routine may safely be used by multiple threads and from within a	signal
       handler.

NOTES FOR FORTRAN
       All MPI routines	in Fortran (except for MPI_WTIME and MPI_WTICK )  have
       an  additional  argument	ierr at	the end	of the argument	list.  ierr is
       an integer and has the same meaning as the return value of the  routine
       in  C.	In Fortran, MPI	routines are subroutines, and are invoked with
       the call	statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm )	are of type INTEGER in
       Fortran.

ERRORS
       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 last	argument.  Before the value is returned, the current MPI error
       handler is called.  By default, this error handler aborts the MPI  job.
       The error handler may be	changed	with MPI_Comm_set_errhandler (for com-
       municators), MPI_File_set_errhandler (for files),  and  MPI_Win_set_er-
       rhandler	 (for  RMA windows).  The MPI-1	routine	MPI_Errhandler_set may
       be used but its	use  is	 deprecated.   The  predefined	error  handler
       MPI_ERRORS_RETURN  may  be  used	 to cause error	values to be returned.
       Note that MPI does not guarentee	that an	MPI program can	continue  past
       an  error;  however, MPI	implementations	will attempt to	continue when-
       ever possible.

       MPI_SUCCESS
	      -	No error; MPI routine completed	successfully.
       MPI_ERR_TOPOLOGY
	      -	Invalid	topology.  Either there	is no topology associated with
	      this communicator, or it is not the correct type (e.g., MPI_CART
	      when expecting MPI_GRAPH ).
       MPI_ERR_RANK
	      -	Invalid	source or destination rank.   Ranks  must  be  between
	      zero  and	the size of the	communicator minus one;	ranks in a re-
	      ceive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.) may also  be
	      MPI_ANY_SOURCE .

       MPI_ERR_ARG
	      -	Invalid	argument.  Some	argument is invalid and	is not identi-
	      fied by a	specific error class (e.g., MPI_ERR_RANK ).

LOCATION
       src/mpi/topo/cart_rank.c

				   9/20/2012		      MPI_Cart_rank(3)
NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETER | NOTES | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS | LOCATION

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