mpi_cart_coords.3

MPI stands for the Message Passing Interface. Written by the MPI Forum (a large committee comprising

.\"Copyright 2006, Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.TH MPI_Cart_coords 3OpenMPI "September 2006" "Open MPI 1.2" " "
.SH NAME
\fBMPI_Cart_coords\fP \- Determines process coords in Cartesian topology given rank in group.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Cart_coords(MPI_Comm \fIcomm\fP, int\fI rank\fP, int\fI maxdims\fP,
	int\fI *coords\fP)

.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_CART_COORDS(\fICOMM\fP,\fI RANK\fP,\fI MAXDIMS\fP,\fI COORDS\fP, \fIIERROR\fP)
	INTEGER	\fICOMM\fP,\fI RANK\fP,\fI MAXDIMS\fP,\fI COORDS(\fI*\fP)\fP,\fI IERROR

.SH C++ Syntax
.nf
#include <mpi.h>
void Cartcomm::Get_coords(int \fIrank\fP, int \fImaxdims\fP, 
	int \fIcoords\fP[]) const

.SH INPUT PARAMETERS
.ft R
.TP 1i
comm
Communicator with Cartesian structure (handle).
.TP 1i
rank
Rank of a process within group of comm (integer).
.TP 1i
maxdims
 Length of vector coord in the calling program (integer).

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
coords
Integer array (of size ndims,which was defined by MPI_Cart_create call) containing the Cartesian coordinates of specified process (integer).
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer). 

.SH DESCRIPTION
.ft R
The inverse mapping, rank-to-coordinates translation is provided by MPI_Cart_coords.

.SH ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object.
.sp
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.  

' @(#)MPI_Cart_coords.3 1.20 06/03/09